THE NERVOUS SYSTEM 



213 



Fig. 104. — Ventral Aspect of the Brain. 



2, 3, 4. 5, 6, 7, 8, 9, 10, II, 12, The cranial nerves; a, ophthalmic branch of the 

 trigeminal nerve; an, anterior pyramids; at, anterior horn of gray matter; h, 

 superior maxillary branch of the trigeminal nerve; iia, eleventh cranial nerve 

 with roots from the spinal cord; c, mandibular branch of the trigeminal nerve; 

 ca, corpus mamillare; ch, cerebellum; cc, canalis centralis; en, cornea; ct, cut 

 surface of spinal cord; ex, external rectus muscle; cr, peduncle of the cerebrum; 

 g, Gasserian ganglion of the trigeminal nerve; hi, pyriform lobe; in, opening 

 into the tuber cinereum revealed by removal of the infundibulum and hypophy- 

 sis; i, internal rectus; to, inferior oblique; ir, inferior rectus; «i and ni, first and 

 second spinal nerves; ol, olfactory lobe; op, optic commissure; ol, optic tract; 

 p, posterior horn of gray matter; pt, anterior perforated space; pv, pons Varolii; 

 r, medial or inner root of olfactory nerve; rt, lateral root of olfactory nerve; 

 pr, postrhinal fissure; sy. Sylvian fissure; s, superior rectus muscle; /s, corpus 

 trapezoideum; x, external arciform fibers. 



