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LABORATORY MANUAL OF HUMAN ANATOMY 



through each optic nerve (N. opticus) as it enters the skull near 

 the foramen opticum. The internal carotid artery (A. carotis 

 inter na) on each side should next be divided, and, behind and 

 between the arteries of the two sides, the infundibulum. Behind 

 and lateralward from each A. carotis interna, cut through the 

 oculomotor nerve (N. oculomotorius). In cutting these nerves, 



FIG. 85. 



Exit and entrance of nervi cerebrales at the base of the skull. 



I, Nn. olfactorii ; II, N. opticus ; ///, N. oculomotorius ; IV, N. trochlearis ; V, N. trigeminus ; VI, 

 N. abducens ; VII, N. facialis ; VIII, Nn. cochleae et vestibuli ; IX, N. glossopharyngeus ; A" N. vagus ; 

 XI, N. accessorius; XII, N. hypoglossus; 1, peripheral olfactory neurones; G. s. G, ganglion semilunare 

 (Gasseri). (From Barker, The Nerv. Syst., New York, 1931, Plate I., Fig. 2.) 



as well as the cerebral nerves farther back, the student is advised 

 to cut close to the point where they pierce the dura mater on the 

 right side and close to the brain on the left side. (Of. Spalteholz, 

 Fig. 705.) The anterior extremity of the medial free margin of 

 the tentorium cerebelli is now visible at its attachment to the pro- 

 cessus clinoideus anterior of the ala parva of the sphenoid bone. 

 Displace it slightly lateralward and find the trochlear nerve 

 (N. trochlearis) ; cut through it on each side. 



