528 



THE CRANIAL NERVES, 



processes of the sella turcica, the fibres of the sensitive root spread out 

 into a comparatively loose network of inosculating bundles, and pass 

 into and through the substance of the Gaxserian .ganglion. This gan- 

 glion forms a flattened, crescentic mass of gray matter, mingled with 



Fig. 174. 



DIAGRAM OF THE FIFTH NERVE AND ITS DISTRIBUTION 1. Sensitive root. 

 2. Motor root. 3. Gasserian ganglion. I. Ophthalmic division. II. Superior maxillary 

 division. III. Inferior maxillary division 4 Supra-orbital nerve, distributed to the skin 

 of the forehead, inner angle of the eye, and root of the nose. 5. Infra-orbital nerve; to the 

 skin of the lower eyelid, side of the nose, and skin and mucous membrane of the upper lip. 

 6. Mental nerve; to the integument of the chin and edge of the lower jaw, and skin and 

 mucous membrane of the lower lip. n, n. External terminations of the nasal branch of the 

 ophthalmic division , to the mucous membrane of the inner part of the eye and the nasal 

 passages, and to the base, tip, and wing of the nose. /. Temporal branch of the superior 

 maxillary division ; to the skin of the temporal region, m. Malar branch of the superior 

 maxillary division; to the skin of the cheek and neighboring parts, b. Buccinator branch 

 of the inferior maxillary division ; passing along the surface of the buccinator muscle, and 

 distributed to the mucous membrane of the cheek, and to the mucous membrane and skin 

 of the lips. I. Lingual nerve; To the mucous membrane of the anterior two-thirds of the 

 tongue, at. Auriculo-temporal branch of the inferior maxillary division; to the skin of the 

 anterior part of the external ear and adjacent temporal region, a?, #, x. Muscular branches} 

 to the temporal, masseter, and internal and external pterygoid muscles, y. Muscular branch ; 

 to the mylo-hyoid and anterior belly of the digastric muscles. /. Sensitive branch of com- 

 munication to the facial nerve. 



the fibres derived from the sensitive root. According to the observa- 

 tions of Kb'lliker, the fibres of the sensitive root simply pass through 

 the gra3 T matter of the ganglion, making no anatomical connection with 

 its nerve cells ; while the ganglion cells, which are mostly unipolar in 



