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Animation of the shoulder joint. The muscles shown are subscapularis muscle (at right), infraspinatus muscle (at top left), teres minor muscle (at bottom left) The movement of the scapula across the rib cage in relation to the humerus is known as the scapulohumeral rhythm, and this helps to achieve a further range of movement. This range can be ...
The subscapularis is covered by a dense fascia which attaches to the scapula at the margins of the subscapularis' attachment (origin) on the scapula. [1] The muscle's fibers pass laterally from its origin before coalescing into a tendon of insertion. [citation needed] The tendon intermingles with the glenohumeral (shoulder) joint capsule. [1]
Hawkins–Kennedy test: a positive test indicates shoulder impingement syndrome; Empty beer can test: a positive test indicates rotator cuff tear, specifically, supraspinatus muscle tear; Drop arm test: a positive test indicates a supraspinatus tear; External Rotation test: a positive test indicates an infraspinatus or teres minor tear
Snapping (grating) scapula . Snapping scapula syndrome, also known as scapulocostal syndrome or scapulothoracic syndrome, is described by a "grating, grinding, popping or snapping sensation of the scapula onto the back side of the ribs or thoracic area of the spine" (Hauser).
Biceps muscle. The rotator cuff (SITS muscles) is a group of muscles and their tendons that act to stabilize the human shoulder and allow for its extensive range of motion. Of the seven scapulohumeral muscles, four make up the rotator cuff. The four muscles are: supraspinatus muscle; infraspinatus muscle; teres minor muscle; subscapularis muscle.
subscapularis muscle. [2] It usually gives 4 branches to innervate the subscapularis, and can give up to 8 branches. [1] teres major muscle. [2] [3] Function.
Although the cause of RSP is multifactorial, two major contributors to RSP are the tightness of the pectoralis minor muscle and the weakening of lower trapezius muscle. [34] As the only scapulothoracic muscle anteriorly originating and inserting to the scapula , the pectoralis minor ’s function in favoring the internal and downward rotation ...
The middle subscapular nerve, known as the thoracodorsal nerve, innervates the latissimus dorsi muscle. [1] The lower subscapular nerve contains two branches. One branch inserts into the lower portion of the subscapularis muscle and the other branch inserts into the teres major.