656 



NERVOUS SYSTEM OF THE HORSE 



cord, extends forward to about the middle of the surface. Here the restiform 

 bodies, which constitute the hps of the fissure, diverge to form the lateral boun- 

 daries of a triangular depression; this is the posterior part of the rhomboid fossa or 

 floor of the fourth ventricle of the brain. The dorso-lateral fissure winds outward 



Fig. 499. — Base of Brain of Hohse, Natural Size. 



and forward to the lateral aspect of the medulla, where it presents the roots of the 

 ninth, tenth, and eleventh cranial nerves. External to it is a distinct oval (nninence 

 on the anterior part of the lateral column, termed the tuberculum cinereum. 

 The central canal of the cord is continued in the posterior part of the medulla, 



