II. Muscles of the Shoulder

The deltoid is clearly divided into acromial and scapular portions. The former arises on the acromion, the latter on the posterior border of the scapula and the aponeurotic covering of the infraspinatus. The scapular part of the muscle is largely inserted into the fascia covering the triceps.

The supraspinatus, infraspinatus, and teres minor do not differ materially from those of the horse.

The subscapularis consists of three portions with a common tendon of insertion.

The teres major and coraco-brachialis resemble those of the horse.