Region: Shoulder

Infraspinatus

Infraspinatus The structure indicated is the infraspinatus muscle of the rotator cuff. The infraspinatus muscle is one of the four muscles of the rotator cuff. The rotator cuff muscles are located in the posterior scapula region and serve to stabilise the glenohumeral joint. There are 4 rotator cuff muscles which can be remembered using the mnemonic SITS: Supraspinatus Infraspinatus Teres minor Subscapularis The supraspinatus and infraspinatus, as their names suggest originate in the fossae above and below the spine of the scapula respectively (supraspinatous and infraspinatous fossae). The supraspinatus, infraspinatus and teres minor muscles insert on to the greater tubercle …

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Infraspinatus

Deltoid Muscle

Deltoid Muscle The structure indicated is the deltoid muscle. There are several muscles which act on the glenohumeral joint to produce movement at the shoulder. The deltoid is a large, powerful superficial muscle which is responsible for giving the shoulder its characteristic contour. The deltoid muscle is comprised of three sets of muscle fibres: Anterior fibres Lateral fibres Posterior fibres The various groups of fibres of the deltoid muscle originate on the clavicle and scapula and converge to insert onto the deltoid tuberosity of the humerus. The anterior fibres originate from the anterior border of the lateral third of the …

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Deltoid muscle

Subacromial Bursa

Subacromial Bursa The structure indicated is the subacromial bursa. The glenohumeral joint is a synovial ball and socket joint between the head of the humerus and the glenoid cavity of the scapula. It is a joint with great mobility, at the expense of joint stability. Movements include: abduction, adduction, medial rotation, lateral rotation, flexion, extension, and circumduction. The joint is stabilised by, surrounding musculature, tendons, ligaments and the bony processes of adjacent structures. The synovial membrane lines the fibrous membrane of the joint capsule and it forms bursae as it passes through various openings in this membrane. Synovial bursae are …

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subacromial bursa

Brachial Plexus

3D video anatomy tutorials on the anatomy of the brachial plexus.
Brachial Plexus

Rotator Cuff

3D video anatomy tutorial on the rotator cuff muscles of the shoulder.
Rotator Cuff Tutorial