THE HEAD AND NECK 



here accessible for operative purposes. Thereafter it crosses the 

 stylo-glossus, and passes forwards over the hyo-glossus close to the 

 side of the tongue. Upon the latter muscle it describes a slight 

 curve with the convexity downwards. It then passes beneath the 

 mylo-hyoid muscle, where it lies above the deep part of the sub- 

 maxillary gland and Wharton's duct, and has the submaxillary 

 ganglion suspended from it. Finally, having crossed Wharton's 

 duct from above downwards, it continues its course as far as the 

 tip of the tongue. As it passes along the side of the tongue the 

 nerve is immediately beneath the mucous membrane. 



Branches of Communioation. — (i) Chorda tympani (sensory of 

 facial) ; (2) two branches to the submaxillary ganglion ; and (3) one 



Sixth Nerve 

 Internal Carotid Artery with • 

 Sympathetic Plexuses ; 

 Facial Nerve in Aqueduct of Fallopius y 



Superior Maxillary Nerve 

 Internal Carotid .\rtery 

 Third Nerve 

 ; ■■ ■. I Optic Nerve 



Chorda Tympani ^ 



Glosso-pharyngeal T 



Inferior Dental-- -J- 

 Spinal Accessory— y — 

 Mylo-hyoid 



Hypoglossal 

 Pneumogastric 



Supra-orbital Nerve 



Supratrochlear 



Frontal 



Infra trochlear 



Nasal 

 Lachrymal (cut) 

 Ophthalmic 

 Infra-orbital 

 Meckel's Ganglion 

 Anterior Dental 



--Middle Dental 



~-^ J- Posterior DentaJ 



' Otic Ganglion 

 >^ "■ Lingual 

 Submaxillary Ganglion 



Ner\-e to Thyro-hyoid Muscle 



Fig. 494. — General View of the Fifth Cranial Nerve (Hirschfeld and 



Leveille). 



I, Sterno-cleido-mastoid ; 2, Mylo-hyoid ; 3, Internal Pterygoid. 



or two filaments to the hypoglossal nerve at the anterior border of 

 the hyo-glossus muscle. 



Branches of Distribution.— (i) Buccal, to the mucous membrane 

 of the floor of the mouth and of the gums ; (2) glandular, to the 

 sublingual gland ; and (3) lingual, to the mucous membrane of the 

 sides and dorsum of the tongue over its anterior two-thirds. These 

 lingual branches pierce the muscular tissue of the tongue, and are 

 destined chiefly for the conical and fungiform papillae. 



Otic Ganglion. — ^The otic ganglion, or Arnold's ganglion, is a 

 small oval body, of a pinkish colour, which is situated close 

 to the foramen ovale, on the deep surface of the inferior maxillary 

 nerve at the place of origin of the internal pterygoid nerve, with 

 which it is closely connected. It has the middle meningeal artery 



