72 ZOOTOMY. 



and F lb , ventral ramus of V 1 orbito-nasal nerve : F 2a , palato-nasal 

 nerve : V 2b , maxillary nerve : F 3 , mandibular nerve : Vfl* t palatine 

 branch of portio dura: ^77 b , hyomandibular branch: c.ty, chorda 

 tympani : VIII, auditory nerve : IX, glossopharyngeal nerve : X, vagus : 

 hy, branch of glossopharyngeal to hyoid arch : br. I, branches of 

 glossopharyngeal and vagus to 1st branchial arch : br. 2, br. 3, br. 4, 

 branches of vagus to 2nd, 3rd, and 4th branchial arches : v, ventral 

 (Lja^tric and cardiac) branch of vagus : /, lateral branch of vagus : br, 

 brachial plexus. 



forward continuations of the ventral pyramids of the 

 medulla oblongata. 



174. The thalamencephalon (Figs. 22, 24, 25, th\ a 

 small division of the brain just anterior to the optic lobes : 

 it consists of two lateral masses of nervous matter, the 

 thalami optici, between which is a space, covered only 

 by pia mater, the thalamoccele or third ventricle (v. 3). 



175. The lobi inferiores (Figs. 23 25, Li) paired 

 ovoidal bodies on the under surface of the thalamencephalon. 



176. The pituitary body or hypophysis cerebri 

 (Frgs. 23 25, //), a rounded structure on the ventral 

 surface of the brain, behind the lobi inferiores and attached 

 to a backward prolongation of the thalamencephalon called 

 the infundibulum ; with it is connected anteriorly the 

 median artery formed by the union of the two internal 

 carotids ( 160). 



177. The saccus vasculosus (Figs. 23 25, s.r, s.r). 

 a thin-walled hollow body, consisting of three lobes, two 

 large and paired, situated one on either side between the 

 pituitary body and the lobi. inferiores, and a median azygos 

 lobe lying in the groove .between the lobi inferiores. 



178. The prosencephalon (Figs. 22 25, c.h\ a large 

 transversely elongated mass, in front of the thalamen- 

 cephalon and representing the fused cerebral hemispheres. 



179. The olfactory lobes (Figs. 22 25, /), two long, 

 nerve-like bodies, given off from the antero-lateral angles 



