590 THE CRANIAL NERVES. 



the middle, and the sheath of the spinal cord opened so as to expose the roots of the 

 cervical nerves. 



Fig. 400, A. 



Fig. 400. A. SEMIDIAGRAMMATIC VIEW OF A DEEP DISSECTION OP THE CRANIAL NERVES 

 ON THE LEFT SIDE OF THE HEAD (from various authors and from nature). B. EXPLANA- 

 TORY OUTLINE OF THE SAME. 



The roinan numerals from I to IX indicate the roots of the several cranial nerves as 

 they lie in or near their foramina of exit. V, is upon the great root of the fifth with the 

 ganglion in front ; a and b, in connection with VII, indicate respectively the facial and 

 auditory nerves ; a, b, and c, in connection with VIII, point respectively to the glosso- 

 pharyngeal, pneumo -gas trie, and spinal accessory nerves ; C I, the suboccipital or first 

 cervical nerve ; C VIII, the eighth. The branches or distributed parts of the nerves are 

 marked as follows, viz. : I, frontal branch of the fifth ; 2, lachrymal passing into the gland; 

 3, nasal passing towards the internal orbitary foramen and giving the long twig to the ciliary 

 ganglion (4') ; 3', external branch of the internal nasal nerve ; 4, lower branch of the third 

 or oculo-motor nerve ; 5, the superior maxillary division of the fifth passing into the infra- 

 orbital canal ; 5', its issue at the infraorbital foramen and distribution as inferior 

 palpebral, lateral nasal, and superior labial nerves (5") ; 6, ganglion of Meckel and 

 Vidian nerve passing back from it ; 6', palatine and other nerves descending from it ; 6", 

 superior petrosal nerve ; 7, posterior superior dental nerves ; 7', placed in the antrum 

 maxillare, which has been opened, points to the anterior superior dental nerves ; 8, 

 inferior maxillary division of the fifth immediately below the foramen ovale ; 8', some of 

 the muscular branches coming from it ; 8 x , the anterior auricular branch cut short, and 

 above it the small pstrosal nerve to join the facial nerve ; 9, buccal and internal ptery- 



