Subscapular muscle

Subscapularis muscle , m. Subscapularis, fills the entire subscapular fossa and is a flat triangular muscle consisting of separate muscle bundles, between which are fascial interlayers. The base of the triangle lies parallel to the medial edge of the scapula, and the apex is formed by converging muscular tufts and is directed toward the outside in the direction of the humerus. In the muscle, two layers are distinguished: superficial and deep. Deep tufts originate from the costal surface of the scapula, and superficial ones originate from the subscapular fascia, which attaches to the margins of the subscapular fossa. Sent laterally, the muscle passes into a small tendon that fuses with the anterior surface of the articular capsule of the shoulder joint (which the muscle pulls during contraction), and attaches itself to the small tubercle and crest of the small tubercle of the humerus. In the area of ​​attachment of the tendon there is a small subculture bag of the subscapular muscle, bursa subtendinea m. Subscapularis, communicating with the cavity of the shoulder joint.

Function: penetrates the shoulder and participates in bringing it to the trunk.

Innervation: n. Subscapularis (CV-CVII).

Blood supply: a. Subscapularis.