Musculoskeletal
The subordinate muscle , m. Infraspinatus, triangular, flat, performs the entire cavitary fossa. The muscle is covered in its entire length from the lateral side of the m. Deltoideus, with medial - m. Trapezius, in the lower departments - m. Latissimus dorsi and m. Teres major. The middle part of the muscle is covered by its own fascia. The muscle begins from the entire surface of the subacute fossa and the posterior surface of the scapula, leaving the outer edge and the lower corner free, and guided laterally. Its tufts, converging, converge into a small short tendon that attaches to the large tubercle of the humerus. The attachment site has a subacute pouch muscle, bursa subtendinea m. Infraspinati.
Function: the raised arm pulls back and rotates the shoulder to the outside.
Innervation: n. Suprascapularis (CV - CVI).
Blood supply: aa. Circumflexa scapulae, suprascapularis.
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