136 



MAMMALIAN ANATOMY 



caudal-medial surface is the continuation laterally and ventrally of 

 the ventral surface of the neck. It is not always well defined from 

 the preceding part. It is narrower at the vertebral end than at the 

 sternal end, and is flat from edge to edge. Its vertebral part is 

 strongly concave dorso-ventrally, and faces medially and ventrally. 

 Its sternal part is nearly straight, and faces medially and toward the 



tail. 



The cephalic-lateral surface (Fig. 96) is arched dorso-ventrally. 



FIG. 96. 



VERTEBRAL END. 



Crest on Dorsal Part of 

 Dorsal- Caudal Border. 



Dorsal- Cephalic 

 Border of Neck. 



Cephalic Part of Cephalic 

 Lateral Surface. 



Angle. 



Ventral Surface. 

 Ventral- Cephalic Border, 



Shaft. 



Caudal Part of Dorsal- 

 Caudal Border. 



Head, 



Articular Surface. 



jNeck. 



.Lateral Part of Cephalic 

 Lateral Surface. 



Cephalic Part of Ventral- 

 Cephalic Border. 



STERNAL END. 



With Costal Cartilage. 



FIFTH RIGHT RIB. ANTERIOR OR CEPHALIC ASPECT. 



It is wider in the vertebral part than in the sternal part, and more 

 convex from edge to edge in the middle than at either end. Its 

 vertebral part, flattened and often marked by a linear groove, faces 

 toward the head, laterally, and slightly dorsally ; the sternal part faces 

 laterally. The two parts are sometimes sharply separated by an 

 oblique line which begins at the angle on the caudal border and passes 

 ventrally to the cephalic border. 



