366 NERVOUS SYSTEM. 
extends ‘thence along the inferior horn of the lateral ventricle 
to its end in the temporal lobe. It is somewhat narrower at 
its lateral end. It is thus curved into a semicircle in conformity 
Fic. 149.—CAUDAL SURFACE OF Fic: 150.—CauDAL SURFACE oF 
TRANSVERSE SECTION OF BRAIN TRANSVERSE SECTION OF BRAIN 
THROUGH THE GENU OF THE THROUGH THE OPpTic CHIAsMA 
Corpus CALLosUM. AND THE:REGION OF THE INTER- 
VENTRICULAR FORAMEN (Fora- 
MEN OF MONROE), 
Fig. 149.—Gray matter dotted; white matter with a few lines. 1, right hemi- 
sphere; 2, left hemisphere. @, corpus callosum, section through genu and rostrum; 
6, cavity of lateral ventricles. 
Fig. 150.—1, right hemisphere; 2, left hemisphere. @, corpus callosum; 4, for- 
nix (cut); ¢, cavity of lateral ventricles; @, fimbria (d@’, cut surface; @, caudal uncut 
surface of the part that curves ventrad); ¢, pillars of fornix; /, anterior commissure; 
&, parts of third ventricle; 4, optic chiasma; 2, parts of corpus striatum. 
Fic. 151.—CAUDAL SURFACE OF ‘TRANSVERSE SECTION OF THE BRAIN THROUGH 
THE TUBER CINEREUM AND INFUNDIBULUM, CRANIAD OF THE Hypopuysis. 
a, corpus callosum; 4, fornix (continuous at the sides with the hippocampus); c, 
cavity of lateral ventricles; ¢, hippocampus; ¢, choroid plexus of the third ventricle 
(roof of the diencephalon); /, dorsal part of cavity of the third ventricle; g, section 
of thalamus; 4, massa intermedia of the thalami, dividing the third ventricle into a 
dorsal (/) and a ventral (2) portion; 2, ventral part of third ventricle; 7, part of optic 
tracts: 4, thin wall of infundibulum, with part of cavity of third ventricle; /, line 
separating roof of thalamus (diencephalon) from floor of hemispheres (telencephalon), 
with the inferior horn of the ventricle. Its dorsal surface is 
convex and looks into the lateral ventricle; its ventral surface 
is concave and rests upon the thalamus and the optic tract. 
