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ROTATOR CUFF

     The muscles of the human rotator cuff stabilize the shoulder joint in addition to contributing to movements such as abduction (supraspinatus), lateral rotation (infraspinatus and teres minor), and medial rotation (subscapularis). Two of the four rotator cuff muscles (teres minor and subscapularis) are of dorsal origin while the other two (supraspinatus and infraspinatus) are of ventral origin.  Amniotes possess a subcoracoscapularis (the subscapularis in mammals) and scapulohumeralis (the teres minor in mammals) (Romer, p. 294).  In reptiles, there is only one muscle, the supracoracoideus, which divides to become the supraspinatus and infraspinatus in mammals (Romer, p. 296)

      In the following images, the supraspinatus, infraspinatus, and teres minor are depicted from lateral views of the shoulder while the subscapularis is depicted from medial views.  The teres major is not a muscle of the rotator cuff but its position is indicated in some of the photos.

 

ALLIGATOR

ROTATOR CUFF

ROTATOR CUFF

OPOSSUM

ROTATOR CUFF

ROTATOR CUFF

CAT

ROTATOR CUFF

ROTATOR CUFF
ROTATOR CUFF

GOAT

ROTATOR CUFF

ROTATOR CUFF
ROTATOR CUFF  
ROTATOR CUFF

SHEEP

ROTATOR CUFF

COW

ROTATOR CUFF

ROTATOR CUFF

PIG

PIG

PIG

MONKEY

ROTATOR CUFF

ROTATOR CUFF

HUMAN MODEL

ROTATOR CUFF

ROTATOR CUFF
ROTATOR CUFF ROTATOR CUFF