Shoulder

Acromioclavicular Joint

Acromioclavicular Joint The structure indicated is the acromioclavicular joint. The shoulder joint complex consists of the three joints: Glenohumeral joint Acromioclavicular joint Sternoclavicular joint The acromioclavicular joint is formed between the acromion of the scapula and the clavicle. It is a small synovial joint that is stabilised by the following ligaments: Acromioclavicular ligament (consists of superior and inferior parts) Coracoclavicular ligaments The coracoclavicular ligaments consist of two parts: Trapezoid ligament Conoid ligament Learn more about the shoulder joint in this anatomy tutorial.

acromioclavicular joint

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

Teres Minor

Teres Minor The structure indicated is the teres minor muscle. The teres minor 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 of …

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Teres minor

Superior Angle of Scapula

Superior Angle of Scapula The superior angle of the scapula is indicated in the diagram. The scapula is a bone that connects the humerus with the clavicle. The scapula consists of two surfaces: Costal Posterior The scapula has three borders: Superior Medial Lateral The scapula has three angles: Superior Inferior Lateral The superior angle of the scapula is covered by the trapezius muscle. It is formed at the point where the medial and lateral borders meet and provides attachment for the levator scapulae muscle and omohyoid muscle. Learn more about the anatomy of the scapula in this tutorial

superior angle of scapula

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

Suprascapular Notch

Suprascapular Notch The structure indicated is the suprascapular notch. The suprascapular notch is a notch in the superior border of the scapula, and lies medial to the base of the coracoid process. The superior transverse scapular ligament runs across the top of the notch, converting it into an opening, or foramen. Below this ligament, the suprascapular nerve passes through. Above this ligament, the transverse scapular vessels pass.

Suprascapular Notch