Where does infraspinatus insert

The rotator cuff is a group of four muscles and their associated tendons that originate from locations on the scapula and insert onto the humeral head. These four muscles (supraspinatus, infraspinatus, subscapularis, and teres minor) stabilize the glenohumeral joint, enable rotation around the joint, and provide a counterforce to the larger ...

Attachments of Subscapularis Muscle: Origin & Insertion. Origin: (proximal attachments) Subscapular fossa of the scapula. Insertion: (distal attachments) Lesser tubercle of humerus. Check out this expert guide on learning the anatomy of the arm and shoulder muscles (step-by-step walkthrough). 1.The supraspinatus muscle is one of four muscles in a group of muscles in the shoulder region known as the rotator cuff. These keep the top of your upper arm bone secured inside the socket of the ...The infraspinatus sits in the infraspinatus fossa, while teres minor sits slightly inferiorly to it. The odd one out in this group is the subscapularis muscle we spoke about earlier in the “muscles that position the shoulder” grouping; it instead inserts on …Study with Quizlet and memorize flashcards containing terms like Where does the trapezius originate?, Where does trapezius insert?, Where does levator scapula originate? and more.Study with Quizlet and memorize flashcards containing terms like Where does pectoralis major insert?, What are the functions of pectoralis major?, Where does pectoralis minor insert? and more.The infraspinatus muscle is part of the rotator cuff. It provides shoulder joint stability and along with the teres minor muscle externally rotates the arm at the shoulder. The infraspinatus muscle is innervated by the suprascapular nerve. The infraspinatus muscle has its origin in the infraspinous fossa of the scapula and inserts into the ...What muscle inserts on the greater tubercle of the humerus? ... The infraspinatus is a thick triangular muscle that occupies much of the infraspinous fossa of the scapula. It is a member of the rotator cuff, commonly remembered by the mnemonic SITS (supraspinatus, infraspinatus, teres minor, subscapularis). ...the infraspinatus and the teres minor which run across the back of the humeral head. Tears in the rotator cuff result from a combination of injury and weakening of the tendon from wear and tear, disuse, repeated use of steroid (cortisone) injection, and smoking. The extent of injury necessary to tear the cuff depends on the quality of the tendon.

Study with Quizlet and memorize flashcards containing terms like T/F The origin of the pectorals major muscle is the coracoid process of the scapula, T/F The coracobrachialis muscle inserts on the coracoid process, T/F The teres minor muscle is innervated by the axillary nerve from C5 & C6 and more.5 jun 2023 ... A grinding or catching feeling when you move your shoulder. Diagnosis of Infraspinatus Pain. Your doctor will review your medical history and do ...Study with Quizlet and memorize flashcards containing terms like 1) What influences the appearance and function of skeletal muscle? A) arrangement of the pattern of fascicles B) number of muscle cells in a motor unit C) presence of perimysium around fascicles D) presence of endomysium around muscle cells, 2) Muscles with a triangular shape, such as the pectoralis major muscle in the chest ...Infraspinous Fossa – large scooped out hollow beneath the spine of the scapula where the infraspinatus originates. Subscapular Fossa – this is on the anterior (front) surface of the shoulder blade. Where is the Subscapular fossa? The subscapular fossa is a landmark of the scapula. As the name implies, it is on the deep side of the …The distal attachments of the three rotator cuff muscles that insert into the greater tubercle of the humerus can be abbreviated as SIT when viewed from superior to inferior (for supraspinatus, infraspinatus, and teres minor), or SITS when the subscapularis muscle, which attaches to the lesser tubercle of the humerus, …[1] Insertion The posterior aspect of greater tuberosity of humerus, and the capsule of shoulder joint. [2] Nerve Supply Suprascapular Nerve (C5 & C6) [3] Blood Supply Suprascapular and circumflex scapular arteries. [3] Action Infraspinatus is the main external rotator of the shoulder joint. It assists in producing shoulder extension.

The supraspinatus and infraspinatus muscles are both innervated by branches of the suprascapular nerve. The teres minor makes up the most inferior portion of the rotator cuff posteriorly. The muscle originates along the dorsal aspect of the lateral margin of the scapula and courses upward and laterally to insert onto the lowest facet of the ...27 ene 2019 ... These parameters would allow the surgeon to clearly define PTRCTs exceeding 50% of tendon depth. Numerous anatomical studies focused on the ...Origin and insertion. The infraspinatus muscle originates from the infraspinous fossa of the scapula, passing over the lateral border of the spine of the scapula before inserting onto the middle facet of the greater tuberosity on the humerus. 6. Innervation. Infraspinatus has the same innervation as supraspinatus – the suprascapular nerve (C5 ...At the back it is continuous with the strong posterior infraspinatus fascia. From the deep surface of the fascia several septa arise which penetrate within the muscles and forms fasciculi. Deltoid muscle (anterior view) ... This muscle attaches to the anterior aspect of the scapula and inserts onto the lesser tubercle of the humerus.infraspinatus meaning: 1. a muscle in the middle of the shoulder blade 2. a muscle in the middle of the shoulder blade. Learn more.The Infraspinatus muscle is one of the four muscles that make up the rotator cuff, the others being: supraspinatus, teres minor and subscapularis. origin: infraspinous fossa of the scapula. insertion: middle facet of the greater tubercle of the humerus. innervation: suprascapular nerve (C5-6)

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Supraspinous fossa of the scapula. (insertion) Supraspinatus. Greater tubercle of the humerus. (action) Supraspinatus. Abduct the shoulder (G/H joint) and stabilizes the head of the humerus in glenoid cavity. (origin) Infraspinatus. Infraspinous fossa of the scapula. (insertion) Infraspinatus.Study with Quizlet and memorize flashcards containing terms like Which two muscles originate on opposite ends of the Clavicle?, Where on the clavicle does the deltoid originate?, Where on the clavicle does pec major originate? and more.A full-thickness tear is when the wear in the tendon goes all the way through the tendon. Partial tears can be just 1 millimeter deep (only about 10 percent of a tendon), or can be 50 percent or deeper. When a radiologist looks at an MRI scan, he or she must make a judgment about the type of the rotator cuff changes.Infraspinatus originates from the infraspinous fossa of the scapula, located on the dorsal aspect of the scapula below the scapular spine. It inserts on the middle facet of the greater tuberosity. Its primary function is the external rotation of the shoulder joint and the abduction of the scapula.Back muscles. The muscles of the back are a group of strong, paired muscles that lie on the posterior aspect of the trunk. They provide movements of the spine, stability to the trunk, as well as the coordination between the movements of the limbs and trunk. The back muscles are divided into two large groups: The extrinsic (superficial) back muscles, which lie most superficially on the back.

The origin of a muscle is the point at which a muscle is attached to a fixed bone, while the insertion of a muscle is the point at which a muscle is attached to a bone moved by that muscle. All voluntary muscles have an origin and insertion...Study with Quizlet and memorize flashcards containing terms like what are the muscles from the pectoral girdle to the humerus?, what structure do the muscles from the pectoral girdle to the humerus produce actions on?, where does subscapularis muscle originate? and more.Study with Quizlet and memorize flashcards containing terms like Where does the supraspinatus originate?, Where does the supraspinatus insert?, What does the supraspinatus do? and more.Study Upper Extremity Myology flashcards from Priyanka Barad's class online, or in Brainscape's iPhone or Android app. Learn faster with spaced repetition.The insertion of the subscapularis is both tendinous as well as muscular. The more superior tendinous portion inserts on the lesser tuberosity while the more muscular portion inserts inferior to the less tuberosity. ... while the infraspinatus and teres minor resist anterior translation. 24,26,35 This concept was demonstrated in a recent study ...Tendinosis of the rotator cuff is a degenerative (genetic, age or activity related) change that occurs in our rotator cuff tendons over time. Rotator cuff tendinosis is exceptionally common. Although many people with shoulder pain will be found to suffer from tendinosis. Many, many people have tendinosis of the rotator cuff and do not even know it.a. supraspinatus b. rhomboids c. deltoid d. infraspinatus, Which of the following acts as an antagonist to the biceps brachii during shoulder flexion? a. pectoralis major (lower fibers) b. pectoralis major (upper fibers) c. deltoid (anterior fibers) d. brachialis, Which muscle acts as a synergist with teres minor during lateral rotation of the ...Study with Quizlet and memorize flashcards containing terms like What is the pectoral girdle designed to do?, Name the two groups in the pectoral girdle., Name the components of the dorsal groups. and more. infraspinatus is the "I" of the SITS rotator cuff, assisting in reinforcement of the shoulder joint capsule and stabalization of the head of the humerus in the glenoid fossa of the scapula for movements of the humerus. Origin Teres Minor. upper 2/3 of axillary border of scapula. Insertion Teres Minor.The infraspinatus insertion at the middle facet of the glenoid tubercle allows it to exert a lateral or external rotational force. This force is synergistic with the teres minor, as it inserts on the inferior facet of the glenoid tubercle.Hydroxyapatite deposition disease (HADD) is an extremely common disorder causing periarticular disease in the form of tendinitis or bursitis. Only rarely does it cause true articular disease. Calcium hydroxyapatite deposits in muscles, capsules, bursae, and tendon sheaths. Although this deposition is associated with many systemic diseases, such ...

Hi, I have pain in my right shoulder. I had an MRI done. Can you please tell me what the following findings mean? 1. Extensive tendinosis versus full-thickness focal tear of the supraspinatus. Tendinosis of the infraspinatus and subscapularis tendons.

Supraspinatus is the most superior of the 4 rotator cuff muscles. It is a small triangular-shaped muscle, situated on the posterior aspect of the scapula. It origins from the medial aspect of the supraspinous fossa, a concave depression situated upper the spine of the scapula. The muscle fibers diverge onto a tendon that runs inferior to the ...A. a muscle working in opposition to another muscle. B. the end of the muscle where the action occurs. C. the muscle that does most of the movement. D. the stationary end of the muscle. E. a group of muscles that work together to cause movement. the muscle that does most of the movement. The prime mover is.Here is a simple stretching exercise that can help to stretch the infraspinatus muscle: Stand with your feet shoulder-width apart and your arms by your sides. Place your left hand on your right elbow, and gently press your right arm across your body towards the left side. Hold the stretch for 30 seconds, then release and repeat on the other side.Borders do everything from enhancing pictures to making it easier to visualize cells in a data table. OpenOffice programs such as Impress, Draw and Writer enable you to add borders to different types of objects quickly. Add a border to a pa...It has a long linear origin extending from the radial tuberosity to the insertion of pronator teres in the distal forearm. From these origin points, the muscular heads of the flexor digitorum superficialis courses distally across the anterior forearm. Usually, the muscle is arranged into superficial and deep layers, or strata.Supraspinatus Tendinopathy is a condition in which there is damage or injury to the supraspinatus tendon. Supraspinatus Tendinopathy is caused normally due to overuse of the arms such as when playing sports like tennis or badminton. Know the causes, symptoms, treatment and recovery period of Supraspinatus Tendinopathy.Origin and Insertion Infraspinatus Action Infraspinatus Function Lesson Summary Frequently Asked Questions What does the infraspinatus muscle do? The …Sagittal-oblique. PD fat sat. Sagittal-oblique. T1. Full-thickness partial width supraspinatus tendon tear, with avulsion from the anterior footplate, and the tear extending posteriorly into the articular surface of the mid tendon critical zone. The full-thickness component measures 19 x 16mm (LR x TR) and the intact supraspinatus tendon is ...Suboccipital muscles. The suboccipital region is a muscle compartment, located inferior to the external occipital protuberance and the inferior nuchal line. These are anatomical landmarks on the occipital bone of the skull. It is of a pyramidal shape and includes the posterior aspects of the atlas and axis (C1 and C2 vertebrae respectively).Treatments can include medications, physical therapy, orthotics, and lifestyle changes. People with enthesopathy typically experience pain and may have stiffness or difficulty moving the affected ...

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Simply a list of all the muscles of the human body that I need to know for my practical. Enjoy. :)Conventional radiography. RCCT typically presents with calcific deposits around the humeral head involving the RC tendons, specifically the supraspinatus tendon (80% of cases), the lower side of the infraspinatus tendon (15% of cases), and the preinsertional part of the subscapularis tendon (5% of cases) [3, 20].CR and US are generally the preferred methods to diagnose RCCT [21, 22].Study with Quizlet and memorize flashcards containing terms like What nerve innervates this group?, Where do both supraspinatus and infraspinatus insert?, Where does supraspinatus originate? and more.Tendinosis is a chronic tendon injury. It causes symptoms such as swelling, burning pain, stiffness, and more. Tendinosis typically happens as a result of overuse of the tendon.5 jun 2023 ... A grinding or catching feeling when you move your shoulder. Diagnosis of Infraspinatus Pain. Your doctor will review your medical history and do ...The suprascapular nerve is the lateral branch of the superior trunk of the brachial plexus . It receives nerve fibers that originate in the nerve roots C5 and C6 (and sometimes C4). The suprascapular nerve is a mixed nerve, meaning that it provides both sensory and motor supply for the suprascapular region. The main function of this nerve is ...The subscapularis, infraspinatus, and teres minor are the primary depressors of the humeral head. The weight of the arm, the deltoid muscle force and the joint reaction force allow the humerus to be rotated, thereby moving the hand above the head. ... If there is a balanced force pulling downwards then the supraspinatus does not need to be ...4.2 Morphology of the infraspinatus muscle. Insertion areas are presented in Table 1 and visualized in Figure 2. There were two constant parts of the infraspinatus muscle. Part 1 (ISP1) was the largest part and had its origin at the infraspinous fossa. Part 2 (ISP2) was smaller, had its origin at the inferior border of the spine of the scapula ...Insertion: Corocoid process. What is the action of pectoralis minor? Lowers Protracts Rotates the scapular ...Where does infraspinatus insert? Greater tubercle of humerus (middle 1/3) What is the function of infraspinatus? Lateral rotation . Where does teres minor originate?Origin: Infraspinous fossa, scapular spine and the caudal border of the scapula. Insertion: Distal to the greater tubercle of the humerus. Action: Outward rotator and abductor of … ….

Fig. 2. The intramuscular tendons of the infraspinatus muscle were counted in a vertical line (dashed above the arrow) midway between the glenohumeral joint space (left-most line) and the insertion of the muscle (right-most line) in the coronal view. The line above the arrow was labeled "the lateral measuring point".Of the 49 rim-rent tears, 24 (49.0%) involved the anterior-most fibers of the supraspinatus tendon, one of which extended to involve the infraspinatus tendon. Twenty-three (46.9%) involved the infraspinatus tendon alone. Two tears were isolated to the more-posterior aspect of the supraspinatus tendon.Start studying Exam 1 - Canine MS. Learn vocabulary, terms, and more with flashcards, games, and other study tools.medial clavicle, sternum, and anterior ribs. Where does the pectoralis major insert? lateral lip of bicipital groove. What 2 actions does pectoralis major do? medial rotation of arm, adduction of arm. Where does pectoralis minor originate? anterior ribs 3-5. Where does the pectoralis minor insert?Origin: Anterior Iliac crest and ilium. Insertion: Lateral condyle of the tibia via the Iliotibial band. Actions: Flexion of the hip. Hip abduction. Innervation: Superior gluteal nerve. Daily uses: Keeping one foot in front of the other when walking. Example strengthening exercise: Standing hip abduction using a resistance band.The infraspinatus muscle is a somewhat thick and triangular shaped muscle of the shoulder and back. It is one of the four rotator cuff muscles of the shoulder and occupies a large part of the infraspinous fossa (which is located on the posterior surface of the scapula). The remaining three rotator cuff muscles are the supraspinatus, teres minor ...In this video we will go through the anatomy of the infraspinatus muscle covering its; origin, insertion, action, nerve and blood supply. We hope you enjoy i...Where does infraspinatus insert? a.) coracoid process of the scapula b.) infraspinous fossa of the scapula c.) acromion and spine of the scapula d.) greater tubercle of the humerus. d.) greater tubercle of the humerus. To allow for flexion, the _____ unlocks the knee joint. a.) biceps femoris b.) sartoriusAccording to that study, a tear location of 13 to 17 mm posterior to the biceps tendon would lie predominantly within the infraspinatus insertion. According to the anatomical study by Minagawa et al. 12 , the location of 13 to 17 mm posterior to the biceps tendon would lie at the junction of the supraspinatus and infraspinatus tendons.Insertion: (distal attachments) a. Middle part of the greater tubercle of the humerus. Do you know the most effective way to learn and REMEMBER anatomy? 1 2 3 4 Actions of Infraspinatus: a. Laterally rotates the arm at the shoulder (glenohumeral) joint. b. Helps stablize the shoulder by drawing the humerus toward the glenoid fossa of the scapula. Where does infraspinatus insert, Teres major muscle. The teres major is a thick muscle of the shoulder joint. It spans from the inferior aspect of the scapula to the proximal part of the humeral shaft. Unlike the teres minor, the teres major muscle does not attach to the capsule of the glenohumeral joint. Thus it is not regarded as part of the rotator cuff muscles., Rotator cuff structure Anatomic overview. The rotator cuff consists of four muscle-tendon units: the subscapularis, infraspinatus, supraspinatus, and teres minor ( Fig. 50.1).These four muscles have their origins on the body of the scapula, a thin sheet of bone, and insert through their tendons onto the greater and lesser tuberosity of the proximal humerus., Supraspinatus muscle: This rotator cuff muscle is deep and originates from the supraspinous fossa which is located on the posterior superior portion of the scapula. It acts as an abductor of the shoulder, and inserts onto the superior facet of the greater tubercle of the humerus. It has an essential role in initiating the first 15 degrees of abduction (move away from the body)., The supraspinatus is a relatively small muscle which is located in the upper shoulder region. The supraspinatus muscle is one of the four rotator cuff muscles, which also include: the infraspinatus, teres minor, and subscapularis muscles. A useful mnemonic to remember these muscles is "SITS" [1] [2]. Occupying the supraspinous fossa of the ..., Study with Quizlet and memorize flashcards containing terms like Deltoid, Clavicle, Acromion process, and spine of scapula, Deltoid tuberosity of humerus and more., Where does the infraspinatus insert? glenoid tubercle The infraspinatus has actions on the head of the humerus. The infraspinatus insertion at the middle facet of the glenoid tubercle allows it to exert a lateral or external rotational force. This force is synergistic with the teres minor, as it inserts on the inferior facet of the glenoid ..., Feb 15, 2020 · What is the infraspinatus muscle? The infraspinatus is a thick triangular muscle that occupies much of the infraspinous fossa of the scapula. It is a member of the rotator cuff, commonly remembered by the mnemonic SITS (supraspinatus, infraspinatus, teres minor, subscapularis). , Inferior to Teres minor. inferior 1/3 of lateral border. 10. Where does the deltoid insert?, Pectoralis Major. Origin. Clavicular head. anterior surface of medial half of clavicle. Sternocostal head. anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle. Insertion. Lateral lip of intertubercular groove of humerus. Action., LAB 9 EXERCISES 9.1.1 9.1. 1. 1. Using the full-scale arm model, locate and identify all four muscles of the rotator cuff, as well as the deltoid muscle and the teres major muscle. 2. The following are muscles of arm rotation and adduction. For each, give its origin (s) and insertion (s) and whether or not it is part of the rotator cuff., Insertion: (distal attachments) a. Middle part of the greater tubercle of the humerus. Do you know the most effective way to learn and REMEMBER anatomy? 1 2 3 4 Actions of Infraspinatus: a. Laterally …, Teres Minor is a narrow muscle which lies below infraspinatus, above teres major and triceps brachii, and deep to deltoid. ... Insertion [edit | edit source] The upper fibres end in a tendon which inserts into the inferior facet of the greater tubercle of the humerus. The lower fibres insert into the humerus directly below the inferior facet of ..., Supraspinatus. Origin: Supraspinous fossa of scapula. Insertion: Superior facet on greater tuberosity of humerus. Action: Initiates and assists deltoid in abduction of arm and acts with other rotator cuff muscles. Innervation: Suprascapular nerve (C4, C5 and C6) Arterial Supply: Suprascapular artery. The medical illustrations contained in this ..., The insertion site of the infraspinatus tendon is not planar but rather slightly curved due to the curvature of the humeral head. Therefore, our "strain" measurements refer to "apparent strain". To evaluate the effect of partial-thickness tears (H1), at each load and rotation, data from each subject was normalized by dividing by the ..., The infraspinatus sits in the infraspinatus fossa, while teres minor sits slightly inferiorly to it. The odd one out in this group is the subscapularis muscle we spoke about earlier in the "muscles that position the shoulder" grouping; it instead inserts on the lesser tuberosity or tubercle., Study with Quizlet and memorize flashcards containing terms like Where do the upper fibres of trapezius originate?, What originate from the external occipital protruberance, superior nuchal line, ligamentum nuchae, spinal process of C7?, Where do the upper fibres of trapezius insert? and more., Rotator cuff structure Anatomic overview. The rotator cuff consists of four muscle-tendon units: the subscapularis, infraspinatus, supraspinatus, and teres minor ( Fig. 50.1).These four muscles have their origins on the body of the scapula, a thin sheet of bone, and insert through their tendons onto the greater and lesser tuberosity of the proximal humerus., Feb 14, 2020 · Massive and retracted tears of the supraspinatus and infraspinatus tendons of the rotator cuff are associated with great pain and disability and may be considered “non-repairable,” depending on the extent of injury and the experience of the treating clinician. The technique of anatomic vector repair of the rotator cuff is a surgical treatment method that enables the surgeon to accurately ... , The infraspinatus muscle is a somewhat thick and triangular shaped muscle of the shoulder and back. It is one of the four rotator cuff muscles of the shoulder and occupies a large part of the infraspinous fossa (which is located on the posterior surface of the scapula). The remaining three rotator cuff muscles are the supraspinatus, teres minor ..., The greater tubercle lies lateral to the head of the humerus as serves as the point of attachment for three of the rotator cuff muscles. There are three flat facets to which these three muscles attach: The supraspinatus attaches to the superior facet. The infraspinatus attaches to the middle facet. The teres minor attaches to the inferior facet., The infraspinatus muscle occupies the infraspinous fossa, and crosses the lateral part of shoulder joint ot the roughened area of the greater tubercle of humerus. It acts as a lateral collateral ligament of the shoulder joint.Origin: Infraspinous fossa, scapular spine and the caudal border of the scapula.Insertion: Distal to the greater tubercle of the humerus.Action: Outward rotator and ... , The greater tubercle of the humerus is an attachment point for three muscles: supraspinatus, infraspinatus, and teres minor muscles. The supraspinatus muscle is located in the supraspinous fossa of the scapula and inserts on the humerus's greater tubercle.. The Infraspinatus muscle is located in the infraspinous fossa of the scapula.. It inserts on the greater tubercle of the humerus., The superior aspect of the greater tubercle is marked by three impressions that serve as attachment points for the supraspinatus, infraspinatus and teres minor muscles. Inferiorly, the greater tubercle forms a well-defined ridge along its length, known as the crest of the greater tubercle., Surgical Intervention for an Infraspinatus Tendon Tear. On the other hand, if the infraspinatus tendon tear is severe in nature and the patient requires the return of maximum shoulder stability surgical intervention may be suggested as the best option. This would include reattaching the healthy tendon to the insertion site of the shoulder complex., Purpose: To retrospectively determine the frequency of posterior and anterior cystic abnormalities at rotator cuff insertion site on the greater tuberosity and to determine their relationship to patient age and rotator cuff disorders. Materials and Methods: Institutional review board approval was given; informed consent was waived. The study was HIPAA compliant. In 238 patients with rotator ..., The remainder of the rotator cuff muscles (supraspinatus, infraspinatus, and teres minor) insert into the greater tubercle. When the subscapularis muscle contracts, it will internally or medially rotate the humerus. The subscapularis is the only rotator cuff muscle that has this function. In certain positions, subscapularis has some adduction ..., The infraspinatus inserts on approximately half of the superior facet and the entire middle facet of the greater tuberosity. The insertion area of the supraspinatus is located at the anteromedial part of the superior facet and is sometimes located at the most superior part of the lesser tuberosity (Figure 10, additional material) [ 17 ]., Study with Quizlet and memorize flashcards containing terms like What is the pectoral girdle designed to do?, Name the two groups in the pectoral girdle., Name the components of the dorsal groups. and more., Deep is towards or at the body surface. false. A ______________ is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and create stability. ligament. A _________ is a tough band of fibrous connective tissue that connects muscle to bone, or muscle to muscle and is designed to withstand tension., The subscapularis muscle is one of the four muscles that make up the rotator cuff, the others being: supraspinatus, infraspinatus and teres minor.. Summary. origin: subscapular fossa of the scapula. insertion: lesser tubercle of the humerus and up to 40% may insert at surgical neck. some fibers also extend to the greater tubercle and bicipital groove. arterial supply: suprascapular, axillary ..., Name the 8 muscles that move the humerus at the glenohumeral joint, The deltoid is a superficial muscle of the shoulder, thus it lies deep only to its overlying fascia, the platysma muscle and skin.Due to its superficial nature, the deltoid can be easily observed and palpated. The deltoid overlies a number of other muscular structures: the rotator cuff muscles (supraspinatus, infraspinatus, teres minor, …, The infraspinatus tendon has a very large and broad tendon attachment, about a half-inch wide or more depending upon the size of the person. The body of the tendon is 1-2 inches long as well. Because it has a poor mechanical advantage, the infraspinatus is a relatively weak muscle in most people.