NERVES 147 



External pterygoid : to external pterygoid (generally given 

 off from buccal) . 



Branches from the posterior (large and chiefly sensory) 

 division : 



The auriculo-temporal nerve comes off by two roots, be- 

 tween which the middle meningeal artery passes ; runs back- 

 wards under external pterygoid muscle, round temporo-maxil- 

 lary capsular ligament, then upwards, with superficial temporal 

 artery, beneath parotid to temporal fossa, where it becomes 

 cutaneous, and lies posterior to superficial temporal artery. 



Branches of the Auriculo-temporal : 



Inferior auricular : to ear below meatus. 



Superior auricular : to integument of tragus, pinna, and to 

 membrana tympani. 



Communicating : to otic ganglion and facial. 



Superficial temporal : to scalp with artery, joins temporal 

 branches of facial. 



Parotid : to gland. 



Temporo-maxillary : to joint. 



The inferior dental nerve passes down internal to externa: 

 pterygoid muscle, and posterior to the lingual nerve ; then 

 between the ramus of jaw and internal lateral ligament, to 

 the inferior dental foramen, along which canal it runs at first 

 anterior and then above the dental artery. It supplies the 

 molar and bicuspid teeth, and emerges at the mental foramen, 

 having just previously divided into two branches, one of which 

 (incisor) is continued in the bone, and the other (mental) it-, 

 continued over the chin. 



Branch before entering the dental foramen : 



Mylo-hyoid : descends in a groove on the inner side of ramus 

 of jaw to outer side of mylo-hyoid muscle, supplying it and 

 giving a branch to the anterior belly of the digastric. 



Branches given off in the dental canal : 



Dental: to molars and bicuspids. 



Incisor: to canine and incisors. 



Mental: passes out ol mental foramen, and divides into 

 branches which supply integument of chin and lower lip, and 

 communicate with the facial. 



The gustatory or lingual nenr* lies at first internal to the 

 external pterygoid muscle ; it then passes downwards in front 

 of the inferior dental nerve, and is joined at an acute angle 

 by the chorda tympani from the facial. Thence it passes down- 

 wards and forwards between internal pterygoid and ramus, 

 over the superior constrictor of the pharynx and on the hyo- 

 glossus above the deep part of submaxillary gland, to the 



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