130 



ANATOMY. 



FIG. 61. ist, Olfactory, nerve of 



arises by 2 roots from the anterior 

 cerebral lobe and I root from the 

 middle lobe, deeply from the optic 

 thalamus, island of Reil, corpus 

 striatum, and anterior commis- 

 sure ; exit\yy 20 branches through 

 the cribriform plate, to the Schnei- 

 derian membrane. Its bulb is a 

 lobe of the cerebrum. 

 2d, Optic, nerve of sight, arises 

 from the optic commissure 2 and 

 tracts, deeply from the optic thal- 

 amus, corpora geniculata,and cor- 

 pora quadrigemina ; exit through 

 the optic foramen to the retina. 



[This nerve and the Optic Tract are 

 more fully described at the end of the 

 volume, under the sub-title, VESSELS 

 AND NERVES OF THE EYE.] 



3d,Motor Oculi, 7 motor of the eye, 

 . arises from the crus cerebri, deeply from the floor of the iter e tertio ad quartam 

 ventriculum ; exit through the sphenoidal fissure, to all the muscles of the orbit 



FIG. 62. 



except the superior oblique and 

 the external rectus, also to the iris. 



4th, Patheticus, 8 motor of the eye, 

 arises from the outer side of the 

 crus, deeply from the valve of 

 Vieussens; exit through the sphe- 

 noidal fissure, to the superior ob- 

 lique muscle of the eye. 



5th, Trigeminus, 9 nerve of sensa- 

 tion, motion, and taste, arises by 

 two roots, from the side of the 

 pons Varolii, 5 deeply from the 

 pyramidal body (motor root), 

 lateral tract of the medulla, the 

 pons, and cerebellum (sensory 

 root). Exit of ophthalmic divi- 

 sion by the sphenoidal fissure; 

 of superior maxillary by the fora- 

 men rotundum ; of inferior max 



