60 ANATOMY OF THE WOOD KAT 



M. teres minor (figs. 13, 28) is a small muscle whose 

 fibers take origin from the lateral surface of an aponeurotic 

 sheet extending along the axillary border of the scapula 

 laterad to that of the caput longus of the triceps. Ex- 

 tending deep to the insertional portion of the infraspinatus, 

 insertion is onto the greater tuberosity of the humerus. 

 The muscle is not very well developed in the present sub- 

 genus and may easily be confused with a part of the in- 

 fraspinatus, but in Neotoma and Teonoma it is more 

 distinct. 



M. teres major (figs. 6, 7, 13, 28, 29) is a thick muscle 

 arising from the ventral portion of the glenovertebral angle 

 of the scapula. Its origin is partly by muscle fibers and 

 partly by aponeurosis upon its ental belly, from which 

 latter some of the fibers of the subscapularis have origin. 

 It passes over the fossa teres major of the scapula to its 

 insertion by a tendon onto the process of the medial ridge 

 of the humerus, adjoining and partially deep to the in- 

 sertion of the latissimus dorsi. 



M. subscapularis (figs. 7, 13, 29) occupies the medial 

 surface of the scapula and is quite complex, being in- 

 completely separable into several parts. In reality there 

 would seem to be two main divisions, although individual 

 variation in the exact grouping of the fibers is great and 

 the two sides of a single specimen may be somewhat asym- 

 metrical in this respect. The more cranial division is in 

 part superficial to the other. It arises from the cranio- 

 dorsal portion of the scapula, cranio-dorsad of the slight 

 subscapular ridge. The more caudal division arises from 

 the remainder of the medial face of the scapula. It de- 

 velops a superficial aponeurosis onto which the more caudal 

 fibers of the muscle are pennated. The common insertion 

 is upon the caudal portion of the lesser tuberosity of the 

 humerus just deep to the original end of the biceps. 



The innervation of all these muscles of the shoulder girdle 

 is by various branches of the fifth and sixth cervical nerves. 



