THE HEAD AND NECK. 



9 1 



Its branches are distributed to the mucous membrane of the floor of the 

 mouth and to the submaxillary gland and its duct. 



The otic ganglion (Fig. 53) is on the inferior maxillary division of the fifth 

 nerve. Its roots are : 



1. Motor, from the inferior maxillary division of the fifth nerve. 



2. Sensory, from the auriculo-temporal branch of the fifth nerve. 



3. Sympathetic > from a plexus on the middle meningeal artery. 

 Give tJie location and relations of the otic ganglion. 



(i) External to it is the inferior maxillary nerve ; (2) Internal to it is the circum- 

 flexus (tensor) palati muscle ; (3) posterior to it is the middle meningeal artery. 



Aside from the three root communications previously given, has the otic 

 ganglion any other communications ? 



Yes ; it communicates with the seventh or facial nerve and with the glosso- 

 pharyngeal by the lesser petrosal nerve. 



ANTERIOR DENTAL MAXILLARY NERVE ORBITAL BRANCH 



MA X1LLA R Y NER I 'E 



MECKEUS GANGLION 



POSTERIOR DENTAL 



LOOP FORMED BY MIDDLE AND ANTERIOR DENTAL NERVES 

 FIG. 55. THK MAXILLARY NERVE SEEN FROM WITHOUT. (Beaunis. ) 



To what muscles are the branches of the otic ganglion distributed ? 

 To the tensor palati and tensor tympani. 



Describe the superior maxillary division of the fifth cranial nerve. (Fig. 55.) 

 This nerve, a branch of the Gasserian ganglion, leaves the cranium by the 

 foramen rotundum in the greater wing of the sphenoid bone. The nerve crosses 

 the spheno-maxillary fossa, enters the orbit by the spheno-maxillary fissure, 

 traverses the infraorbital canal in the floor of the orbit, appears on the face at 

 the infraorbital foramen, and here communicates with the infraorbital branch of 

 the seventh nerve to form the infraorbital plexus. 

 Its branches are both numerous and important : 

 i. The nasal, labial, and palpebral on the face. (Fig. 53.) 

 Anterior superior dentals to incisor teeth. (Fig. 53.) 

 Posterior superior dentals to molar teeth. (Fig. 53.) 



4. Spheno-palatine branches to Meckel's ganglion. (Fig. 53.) 



5. Temporo-malar are cutaneous to the cheek and temple. 

 A recurrent meningeal branch to the dura. (Fig. 53.) 



2. 



3- 



6. 



