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.