184 PROCEEDINGS OF THE AMERICAN ACADEMY. 



(//) Ramus maxillaris trigemini emerges from the Gasserian gan- 

 glion in the same transverse plane with r. buccalia and r. ophthalmicus 

 Bnperficialia VII., and the three appear | Fig. 2) as one nerve for a short 

 distance, as they pass laterad and cephalad between m. temporalis and 

 m. masseter. While ramus ophthalmicus Buperficialis VII. separates from 

 the others and curves mesiad, rami maxillaris V. and bnccalis VTI. pass 

 cephalad along the dorso-lateral surface of the masseter muscle. In 

 many of the specimens examined the two appear like one nerve, hut the 

 difference in the size and distribution of the fibres was always noticeable, 

 and in the series of sagittal sections used for reconstructions they were 

 clearly separate. R. maxillaris ( V. mx.) gives off a small general 

 cutaneous branch, not shown in the drawings, to the dorsum immedi- 

 ately after leaving the ganglion, and its final distribution is to the skin 

 of the cheek. It does not anastomose with ramus palatiuus VII., as is 

 the case in the tadpole of Rana (Strong). 



(c) Ramus mandibularis trigemini ( V. md.) leaves the ganglion 

 directly below ramus maxillaris, passes ventro-laterad, gives nil first a 

 branch | J'/i) to m. masseter, next, two more small brandies (not 

 figured) to the same muscle, and then a fourth { J y), which runs 

 dorsad to m. temporalis. In the same transverse plane with I y there 

 aii>es a cutaneous branch ( 1 7,), which runs ventro-laterad and is dis- 

 tributed to the skin posterior to the angle of the jaw. It comes into 

 very close connection with the more anterior branch of ramus man- 

 dibulars externus VII. ; in some series of sections it even appears to 

 anastomose with this branch of VII. ; but other sections show conclu- 

 sively that it does not. Another general cutaneous branch ( JY) is 

 given (iff from ramus mandibularis V. to the angle i>f the jaw, a small 

 twig from it turning caudad; the main branch | I'd. however, runs 

 forward, close above ramus mandibularis externus VII. to the skin of 

 the lower lip. A division of the main oerve into nearlj equal parts 

 | I. nut. i, and J '. md. ex.) soon occurs. A musculo-cutaneous branch 

 ( I '. md. i ). Gaupp'a ramus mandibularis internus V., passes ventrad 

 between os dentale and .Meckel's cartilage to the lower Bide of the jaw, 



where it innervate^ m. mylohyoideus and the skin superficial to it. 

 The other branch | I'. ///'/. ex.), which is purely cutaneous, remains on the 



upper -id>- of the jaw and is distributed to the skin of the lower lip. It 

 corresponds to Claupp's ramus mandibularis externus V. 



