256 ZOOTOMY. 



339. The cerebellum (Fig. 58, cb\ a median, laterally 

 compressed, crest-like mass, lying above the anterior part of 

 the medulla oblongata ; it is marked by transverse furrows or 

 sulci, between which are elevations or gyri : on the lateral 

 surfaces of the cerebellum the sulci and gyri radiate from 

 an area on which is a slight elevation, the flocculus (/) : 

 the cerebellum has a pink tint in the fresh brain, being 

 composed externally of grey matter. 



340. The optic lobes (<?./), paired, white, ovoidal bodies, 

 situated one on either side, immediately in front of the 

 medulla and below the cerebellum. 



341. The cerebral hemispheres (c.h\ paired, obtusely 

 conical bodies, in close contact with one another, and 

 situated immediately in front of the cerebellum and optic 

 lobes, with both of which their hinder surfaces are in contact : 

 they consist externally of grey matter. 



342. The pineal body (pn\ a small rounded mass on 

 the dorsal surface of the brain, wedged in between the 

 cerebral hemispheres and the cerebellum. 



343. The olfactory lobes (olf\ small blunt projections, 

 connected one with the anterior end or apex of each 

 cerebral hemisphere : from them the olfactory nerves 

 (first pair of cerebral nerves) are given off to the nasal sacs. 



344. The optic tracts (o.t\ forming a broad, white 

 transverse band, concave forwards, between the optic lobes, 

 on the lower surface of the brain : from their anterior 

 median region the optic (second) nerves (u) spring. 



345. The infundibulum (//), a rounded area with 

 a central aperture, just posterior to the optic tracts : to 

 it is attached the pituitary body, which is usually 

 detached in removing the brain from the skull. 



346. The third nerve (in), arising close behind the 

 infundibulum, a short distance from the middle line, from a 



