FIG. 90. VENTRAL ASPECT OF THE BRAIN. 



2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, The cranial nerves; a, ophthalmic branch 

 of the trigeminal nerve; an, anterior pyramids; at, anterior horn of 

 gray matter; b, superior maxillary branch of the trigeminal nerve; 

 1 la, eleventh cranial nerve with roots from the spinal cord ; c, mandib- 

 ular branch of the trigeminal nerve; ca, corpus albicans; cb, cere- 

 bellum ; cc, canalis centralis ; en, cornea ; ct, cut surface of spinal cord ; 

 ex, external rectus muscle; cr, crus cerebri; g, Gasserian ganglion 

 of the trigeminal nerve ; hi, pyriform lobe ; in, opening into the tuber 

 cinereum revealed by removal of the infundibulum and pituitary 

 body ; i, internal rectus ; io, inferior oblique ; ir, inferior rectus ; n } and 

 n. 2l first and second spinal nerves; ol, olfactory lobe; op, optic com- 

 missure ; ot, optic tract ; p, posterior horn of gray matter ; pt, anterior 

 perforated space ; pv, pons Varolii ; r, mesal or inner root of olfactory 

 nerve ; rt, lateral root of olfactory nerve ; pr, postrhinal fissure ; sy, 

 Sylvian fissure ; s, superior rectus muscle ; tz, corpus trapezoideum ; 

 x, external arciform fibers. 



190 



