252 NERVOUS SYSTEM. 



THE CRANIAL NERVES. 



r Ethmoidal foramina, 20, 



ist NERVE, Olfactory. Function smell. ExitI in cribriform plate of Eth- 



v moid bone. 



Ext. tf00/,Temp.-sphen. lobe,\ rExt. Filaments, to outer wall of nasal cavity. 



Mid. Root, Olfac. tubercle, > 1S ' < Mid. Filaments, to root of cavity. 

 Int. Root, Gyrus fornicat. ) &r ^Int. Filaments, to Septum nasi. 



2d NERVE, Optic. Function, sight. Exit, Optic foramen 



Optic thalamus \ f Longitudinal \ 



Corp. geniculata > Fibres < Decussating >Left Optic Tract ~| 



Corp. quad. ant. > { Inter-cerebral ) OPTIC 



I COMMISSURE^ 



Corp. qua. ant. -v , /wter-^ra/ ^ 



Corp. geniculata > Fibres < Decussating y Right Optic Tract 



Otic thalamus ) ^ Longitudinal J 



Corp. quad. ant. -v , /wter-^^ra/ ^ or CHIASM. \ 



Optic thalamus ) Longitudinal J ^/ 



r Longitudinal, to temporal % of retina ^ 



Optic N.^ Decussating, fr. opp. tract to nasal l / 2 of ret. > L. Eye. 



OPTIC 

 COMMISSURE 

 or CHIASM. 



2d 



v Inter-retinal, fr. opp. retina to retina 

 i Inter-retinal, fr. opp. retina to retina 



Optic N.j Decussating, fr. opp. tract to nasal % of ret. } R. Eye. 

 ^-Longitudinal, to temporal y z of retina. 



3d NERVE, Motor Oculi. Function, motion. Exit Sphenoidal fissure. 



Corp. quadrig. ~| 



Valve of Vieus. I (Sup. Branch, to Lev. palp, sup., Rectus superior. 



Aqued. of Syl. J 3 ' 1 j n f. Branch | to Rectus int -) Rect. inf., Inf. oblique. 

 Cruscerebri. J * motor root to Ciliary Ganglion. 



Supplies all the Ocular muscles, including iris, except Sup. oblique and Ext. Rectus. 



4th NERVE, Trochlear. function, motion. Exit Sphenoidal fissure. 



Valve of Viral \ 4th N. I to Sup< Obli( l ue on "PPer (orbital) surface. 

 Crus cerebri / Branch to Cavernous Plexus of Sympathetic. 



Is the smallest cranial nerve, with the longest nerve-course in the cranial cavity. 



