Deltoideus

M. deltoideus

Shoulder flexor lying on the lateral surface of the scapula and proximal humerus.

Draft, not yet reviewed by a veterinarian. Content may contain errors. It is published so the community can review it.

This piece is a schematic shape, not a scan: there is no freely licensed model for this structure yet.

3D model of this piece: Vet Atlas procedural musculature, CC BY-SA 4.0

Overview

It has two parts converging on the deltoid tuberosity:

Scapular part (pars scapularis): arises by an aponeurosis from the spine of the scapula and covers the infraspinatus.
Acromial part (pars acromialis): smaller and spindle-shaped, from the acromion.

Spine of the scapula (scapular part) and acromion (acromial part).

Deltoid tuberosity (tuberositas deltoidea) of the humerus.

Flexes the shoulder and abducts the arm.

Axillary nerve (n. axillaris).