| OCR Text |
Show «18U DR. B. C. A. WINDLE AND MR. F. G. PARSONS ON THE [Apr. 6, Supra- aud Infraspinatus.-These muscles always rise from the dorsal parts of their respective fossae and are inserted into the great tuberosity of the humerus. The former muscle is usually the larger and considerably overlaps the cephalic border of the scapula (see fig. 8). In Herpestes griseus (24) some of its fibres are continued into the deep part of the pectoral. Macalister (IX.) found the supra-spinatus of Viverra civetta divided into two parts, prescapular and spinous, but this arrangement has not been recorded again. Fig. 8. Arm-muscles of Co ids familiaris. Subscapulars.-The subscapularis usually consists of four bundles, the anterior (cephalic) two of wdiich are bipenniform, while the posterior (caudal) two contain parallel fibres. A s they near their insertion into the lesser tuberosity of the humerus the most anterior bundle becomes superficial to the second, and this, in its turn, superficial to the third. The fourth or most posterior bundle is very distinct and rises from the axillary border of the scapula ventral to and continuous with the origin of the teres major, by whose nerve it is supplied. Haughton (XXI.) describes this part in the Black Bear as an infraspinatus secundus, but says that it may belong to the subscapularis (see fig. 8). Teres major.-The teres major rises from the axillary border of the scapula in its dorsal third; as has been pointed out, its origin is continued towards the glenoid cavity by the fourth bundle of the subscapularis. - It is inserted into the anterior surface of the |
