Muscle, Infraspinatus (M. Infraspinatus, Pna, Bna; M. Infra Spinam, Jna)

The back muscles are divided into external (mm. dorsi externi), muscles of the lateral surface (mm. laterales) and back muscles in front (paracervicula). The name back muscles refers not only to a large muscle, the iliocostalis, but also to another large muscle of the belt with 3 heads: the right and left scapular and one axillary.

We call the infraspinatus a separate group of external muscles that form the infraspinatus fossa. This muscle group forms a complex arch along the inner edge of the scapula, the convexity of which is directed back and inward, and the upper part is stretched around the apical point known as the "ko"

Muscles. The infraspinatum muscle (Infraspinatum; lat. Pars infraspinatoria m. latissimi dorsi; lat. “the part under the scapula of the latissimus dorsi”), or the subscapularis muscle, is a paired flat muscle of the medial side of the back, adjacent to the lateral side of the latissimus muscle. It lies under the infraspinatus muscle and covers the body of the scapula below its lateral angle. In the latero-medial direction it ends in a fan-shaped thickening, from which the wide tendon part diverges radially in the form of a fan. It is a powerful wing consisting of bundles of muscle fibers. Originates from the superior articular surface of the scapula behind the lateral ridge (rib) and lateral to the spinal column. It goes along it and repeats the angle between the first and second ribs. The anterior attachment of the muscle in the form of a dense layer is adjacent to the posterior edge of the tuberosity. Reaching the inner edge of the scapula, the fan-shaped tendon part starts from the outer edge of the scapula. The muscles are located on top of the infraspinous muscle and together form a triangular superficial apex on the posterior surface of the scapula (hunchback muscle), which is bounded by the edge of the scapula and the inferior angle of the scapular foramen. The infraspinatus muscles are woven into the lateral edge of the scapula and do not extend