TROCI.ODVTES NICER, THF. CHIMPANZEE 



607 



LEVEL OI-- THE ANILKlOli COMM ISSIKE ( MG. 2-1) 



At til is lc-\ t'l \Uv sc'ftion indicatrs the cxtrrnu' cephalic- limit of the brain 

 stem, in it are shown the eephalie portion of the third \c-ntriele ( V e n iii) 



ITG. 2-1. CHLMFANZEE. LE\ EL OF THE WIEKKJK CU.NLMISSLKE. 

 AC, Anlcrior Comniissiirc; cix, Internal Capsuk-; tdp, Dcsci-ndinfi; Pillar of Fornix; for. Fornix; clp. Globus 

 Pallidus; nca, Caudate Nucleus; M., Lateral Nucleus of Tlialarnus; I'lr, Putanien; nm. Nucleus Masticato- 

 rius Trigemini; vem hi. Third Ventricle. |Accession No. I57. Section goo. Actual Size 45 X 17 mm.] 



approachinu tlu' lamina termmahs and bounded upon either side by the 

 eephalie portion ol the optie thalami. 0\'erl\ ing the roof of tiie third 

 v'entricle is the eonipaet mass ol libers lormnifi the corpus callosum, depend- 

 ent Irom which are portions ol the anterior pillars of the fornix (Eor) 

 Beneath the lloor ol the \entricle passes the anterior commissure f AC) con- 

 neetmg one hemisj^here with the other, the most cephalic link of communi- 

 cation. Separating the cephalic e\tremit\- ol the oj)tic thalamus from the 

 globus pallidus ol the corpus striatum is a dense bundle of fibers constitut- 

 ing the anterior limb of the internal capsule (Cin). The more important 

 structures in the section are indicated by appropriate letters intlie caption. 



