86 



ANATOMY AND PHYSIOLOGY- 



sheaths, bound together by a strong covering (neurilema) as seen in 

 the following figure. 



When we examine the outer surface of the brain,* we observe it 

 folded or convoluted, as seen in Fig. 32, a, a, a ; and when it is cut 



* The functions of the different nerves, which will be immediately adverted to, may 

 be made plain by having a large drawing so colored as to distinguish each kind. 

 The following may be placed beneath the drawing : 



NERVES OF SENSATION (colored red). (Fig. 32.) No. 1, olfactory No. 2, optic- 

 No. 5, 5' branches of the fifth nerve 7' auditory nerve. 



NERVES OF MOTION (colored blue). Nos. 3, 4, 6, goto the muscles of the eye No 

 7 (portio dura) goes to the sides of the head and face 8", the spinal accessory nerve, 

 goes to the muscles of the shoulder 9, goes to the muscles of the tongue. 



NERVES BOTH OF SENSATON AND MOTION, OR MIXED NERVES (colored brown) 

 5", the lowest branch of the 5th nerve (the brown color to commence where the upper 

 branch of 7 crosses it 10, 11, 12 and all below this. 



DOUBTFUL NERVES colored (black). 8, the glossopharyngeal 8', the par vagum. 



