134 



MAMMALIAN ANATOMY 



attached to the ridge which separates these facets and converts this 

 costo-vertebral joint into two distinct synovial cavities. 



The Neck is of small extent, and is little narrower than the head. 

 It is four-sided, with the dorsal and ventral sides somewhat narrower 

 than the cephalic and caudal sides. The dorsal surface is convex 

 from the cephalic to the caudal edge and concave from the lateral to 

 the medial end, and forms, with the concave ventral surface of the 

 transverse process, an arterial costo-vertebral canal (Fig. 44). The 



FIG. 95. 



VERTEBRAL END 



Tubercle, Articular Surface. 

 Dorsal-Caudal Border of Neck. 



Crest on Dorsal Part of Dorsal- 

 Caudal Border. 



Head,\ Articular Surface - 



(. Pit for Ligament. 



Neck, { 



Ventral Surface. 

 Ventral-Caudal Border: 



Caudal Part of Caudal-Medial 

 Surface. 



Angle. 



Medial Part of Caudal- 

 Medial Surface. 



Caudal Part of Dorsal- 

 Caudal Border. 



STERNAL END 



With Costal Cartilage. 

 FIFTH RIGHT RIB. POSTERIOR OR CAUDAL ASPECT. 



cephalic and caudal surfaces are convex from the dorsal to the ventral 

 edge, and very nearly flat from end to end. The ventral surface is 

 longer than the dorsal, owing to the oblique position of the articular 

 surface on the head. It is slightly concave from end to end, and 

 convex from the cephalic to the caudal edge. 



At the junction of the neck with the shaft, on the dorsal aspect 

 of the rib, is a flattened, oval elevation known as the tubercle. It is 



