716 THE NERVES. 



It gives some very fine filaments to the external pterygoid, in its passage 

 across that muscle. Beyond this, it furnishes a very slender ramuscule to 

 the orbital portion of the temporal muscle the analogue of the anterior deep 

 temporal of Man. 



On the superior molar gland, it emits a fasciculus of branches to this 

 organ and the alveolo-labialis muscle. In its submucous track it throws 

 off, at certain distances, ramuscules of various sizes which go to the 

 inferior molar gland and the buccal membrane; while its terminal filaments 

 are expended in the lining membrane and glands of the lips, near the 

 commissure. 



The majority of the filaments given off by this nerve to the external 

 pterygoid and temporal muscles are doubtless motor, but the other ramus- 

 cules are sensitive ; even those distributed to the alveolo-labialis muscle 

 are no exception, for its submasseteric portion is supplied by the facial, as 

 well -as the superficial or anterior part. 



3. INTERNAL PTERYGOID NERVE. It forms, with the preceding nerves, 

 a single fasciculus, which leaves the anterior part of the inferior maxillary 

 nerve. After crossing, outwardly, the internal maxillary artery, it descends 

 between the nervous trunk from which it emanated, and the external layer 

 of the tensor palati muscle, to go to the inner side of, and become expended 

 in, the internal pterygoid muscle. 



This nerve is the smallest branch of the inferior maxillary trunk, after 

 the mylo-hyoid, and excites the contraction of the muscle receiving it. 



4. SUPERFICIAL TEMPORAL OR SUBZYGOMATIO NERVE (Figs. 336, 8 ; 342, 3). 

 This arises from the inferior maxillary nerve, at the opposite side of the 

 fasciculus formed by the three preceding branches, or posteriorly. Placed at 

 first at the inner side of the temporo-maxillary articulation, and between it 

 and the guttural pouch, it is afterwards directed downwards and outwards, 

 passes between the parotid gland and the posterior border of the inferior 

 maxilla, and below the condyle ; it then bends round the neck of that bony 

 eminence to arrive beneath, and to the outside of, the precited articulation, 

 where it terminates by anastomosing with the facial nerve. 



In its course it sends off numerous fine filaments to the guttural pouch, 

 the parotid gland, and the integuments of the temporal region. Among 

 the latter, it is necessary to notice more particularly those which accompany 

 the superficial temporal artery. 



The superficial temporal nerve appears to be exclusively sensitive. 

 Section of it, before it anastomoses with the facial nerve, does not really 

 prevent contraction of the muscles which receive the divisions of the plexus 

 formed by this anastomosis. 



5. GUSTATORY NERVE 1 (Figs. Ill, 17; 336. 10; 342,5). The gustatory 

 nerve, the principal branch of the inferior maxillary trunk, which it almost 

 equals in volume, is detached at an acute angle from the anterior border of that 

 nerve shortly after its exit from the pterygoid muscles. To accomplish its 

 course, which it effects in describing a slight curve whose concavity is untero- 

 posterior, it is directed forwards and downwards, passing between the 

 internal pterygoid muscle and the branch of the inferior maxillary bone, 

 and gaining the base of the tongue, where it is situated beneath the 

 buccal mucous membrane. It afterwards descends more deeply, between 

 the mylo-hyoid and hyo-glossus longus muscles, turns round the inferior 



1 (Professor Chauveau designates this the lingual, or small hypoylossal nerve. To 

 prevent confusion I have, in preference, retained the usual designation given to it in this 

 country.) 



