174 



VETERINAKY PHYSIOLOGY 



2. Fibres to the limbs and trunk run down between the deep 

 and superficial transverse fibres (fig. 87, P.). 



Ingoing Fibres. The fillet fibres in the pons, instead of 

 running up on each side of the middle line, spread out into a 

 horizontal arrangement above the crossed fibres (fig. 87, F.). 



The nucleus of Deiters and the nuclei of various cranial 

 nerves lie in this region of the brain. 



The connections of the transverse fibres are considered 

 on p. 177. 



D. CEREBELLUM 



Structure 



The cerebellum (fig. 86) or lesser brain lies above the fourth 

 ventricle, and is joined to the cerebro-spinal axis by three 



FIG. 88. Diagram of the Arrangement of Fibres and Cells in the Cortex of 

 the Cerebellum. G.L., molecular layer; N.L., nuclear layer; P., 

 Purkinje's cells sending out axons to the deeper ganglia. (After RAMON 

 Y CAJAL.) 



peduncles on each side (figs. 81 and 89). It consists of a 

 central lobe, the upper part of which is the superior vermis 

 (fig. 87, S. F.), and two lateral lobes, each with a secondary 

 small lobe, the flocculus. Its surface is raised into long ridge- 

 like folds running in the horizonal plane, and is covered over 

 with grey matter, the cortex. 



In the substance of the white matter forming the centre of 



