The Nervous System 135 
gins of the other cranial nerves were described in 
connection with the lateral view of the brain, where 
they show more clearly. On each side of the cere- 
bral peduncles is seen the ventrolateral edge of 
the corresponding optic lobe. The pyramidal 
tracts are seen, extending caudad from the region 
of the peduncles, as a swelling on each side of the 
median ventral fissure. 
THE CRANIAL NERVES (CROCODILE) 
The origin of each of the cranial nerves was de- 
scribed in connection with the lateral and ventral 
views of the brain. A full description of the 
distribution of these nerves would require more 
space than the limits of this book will allow, but 
a brief account will now be given. 
I and II. The olfactory and optic nerves. 
These two large nerves go immediately to their 
respective sense organs, so that no further discus- 
sion of them need be here given. 
III. The oculomotor nerve. The single stem 
divides into three branches: a median, going to 
the externus rectus muscle; a lateral, going to the 
inferior rectus muscle; and an intermedial, going 
to the inferior oblique muscle. 
IV. The trochlear (pathetic) nerve leads to 
the superior oblique muscle. 
V. The trigeminal nerve. The distribution 
of this nerve is very complicated. It has three 
