THE RRAIX OF MODERN MAN 



835 



which form thr optic thalami. In the most ventral position and forming 

 the iloor of the ventricle at this level is the optic chiasm (Opx) into 

 which enter the optic ner\es and from which th(,' optic tracts depart on 



FIG. 35-. -MAN. LE\ EL OF THE ANTERIOR COMMISSURE. 



AC, Anterior ("ommissurc; ciN, Intirnal Capsule; fdp. Descending Pillars of the Fornix; for, Fornix; CLP, 

 Globus Pallidus; .nm. Nucleus Masticatorius; pl"T, Putamen. [Accession Man. Section N 1052. Actual Size 

 63 X 29 mm.] 



their way to the several relay stations before they end in the occipital lobe. 

 The third ventricle is divided into a dorsal and a ventral division by the 

 interposition of the commissura mollis. The thalamus is contiguous with 

 a dense bundle of fibers constituting the internal capsule (Cin) which 

 represents the cephalic continuation of the cerebral peduncles. The capsule 

 is placed between the ventrolateral surface of the thalamus and the mesial 

 surface of the corpus striatum which in this section presents the two major 

 portions of the lenticular nucleus, the globus pallidus ( Glp) and the putamen 



