72 



Anatomy of the Rabbit. 



slender funnel-like structure, the infundibulum, the tip of J:he 

 latter being in contact with the pituitary body or hypophysis and 

 its base connected with a small grey elevation, the tuber cinereum. 



ibo 



PR- 



MS 



RH 



c 



30- 



Fig. 39. Plan of the divisions of the vertebrate brain: A. embryonic; B, 

 adult, projection from dorsal surface; C, adult, sagittal section. The contour 

 of the mammalian brain is indicated by broken lines. 



Primary divisions — PR, prosencephalon; T, telencephalon; DI, diencep- 

 halon; MS, mesencephalon; RH, rhombencephalon; MT, metencephalon; 

 MY, myelencephalon; S, spinal cord. 



a.c, cerebral aqueduct; b.o., olfactory bulb; c, corpora quadrigemina; 

 cb., cerebellum; cm., mamillary body; CO., optic chiasma; cp., pineal body; 

 f.i., interventricular foramen; h., hypophysis; h.c, cerebral hemisphere; in., 

 infundibulum; l.t., lamina terminals; p., pons; pi., chorioid plexus of third 

 ventricle; p.c, cerebral peduncle; t., thalamus, also indicates position of massa 

 intermedia; v.l., lateral ventricle; v.m.p., posterior medullary velum; v.q., 

 fourth ventricle. 



Its cavity is the recessus infundibuli. Immediately in front of 

 the infundibulum the ventral portions of the optic tracts join to 

 form the optic chiasma, and immediately behind it the floor is 



