Deltoid
Deltoid muscle, m. Deltoideus, covers the shoulder joint. The muscle is thick, has the shape of a triangle, turned upside down, and the apex down. It consists of large muscle beams, fan-shaped converging at the apex. It starts from the collarbone and scapula; Is attached to the deltoid tuberosity of the humerus. Between the lower surface of the muscle and the large tubercle of the humerus lies a considerable size of a counterfeit bag, bursa subdeltoidea.
Somewhat higher and posteriorly, under the beak-acromial ligament and acromion, there is a small pokkromialnaya bag, bursa subacromiaiis.
Function: pulls the shoulder forward and somewhat penetrates it, pulls the shoulder outward, to the horizontal plane, pulls the arm back, somewhat supining it.
Innervation: n. Axillaris (CV-CVI).
Blood supply: aa. Circumflexa humeri posterior, thoracoacromialis.
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