Deltoideus

M. deltoideus

Muscle on the lateral side of the shoulder; flexes the shoulder and abducts the arm.

Laterality:: Paired (left and right)

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

View piece alone in 3D

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

Classic feline anatomy texts describe three deltoids: clavodeltoid, acromiodeltoid and spinodeltoid. The clavodeltoid is the cleidobrachialis, which veterinary nomenclature places in the brachiocephalicus. The other two are the parts of the deltoideus:

Scapular part (pars scapularis): the spinodeltoid. It arises from the spine of the scapula and covers part of the infraspinatus.
Acromial part (pars acromialis): the acromiodeltoid, shorter, arising from the acromion.

Origin

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

Insertion

Deltoid tuberosity (tuberositas deltoidea) of the humerus.

Action

Flexes the shoulder and abducts the arm.

Innervation

Axillary nerve (n. axillaris).