494 



THE ANATOMY OF THE HORSE 



lateral lobes are flattened and oval, to coiTespond with the inferior surfaces 

 of the tentorium cerebelli. The cerebellum is made up of alternate layers 

 of grey and white matter, the former being distributed throughout the 

 interior in such a way that when sliced it presents an arborescent appearance. 

 On parting the hemisphei-es of the cerebrum, the convolutions on the surface 

 of which are composed of grey matter, a white band slightly striped from 



FiG. 83.— View of the Superior Surface of the Encephat, 



a Anterior termination of the longitudinal fissure. 

 I. b. Lateral hemispheres of'the cerebrum. 

 c. c. c. Corpus callosum. 



(?. Middle lobe of the cerebellum. 



e. e. Superior median fissure. 



/. 0- Membranes covering the spinal cord. 



side to side makes its appearance. This is the corpus callosum, which is 

 the great commissure, and consists entirely of white fibrous matter, uniting 

 the two halves. Beneath this, on each side, are the lateral ventricles, and 

 within each are the optic thalamus and corpus striatum, with the choroid 

 plexus lying between. Turning the brain with its inferior surface in vievv 

 it presents anteriorly the continuation of the longitudinal fissure. On each 

 side of this are the olfactory nerves, which look like prolongations of the 

 hemispheres. Close beliind these two are the optic or second pair of nerves, 

 connected together by their commissure. Then two small white bodies, th© 



