516 H. W. NORRIS AND SALLY P. HUGHES 



Between the exit from the Gasserian ganglion and the entrance 

 into the bony jaw, the ramus mandibularis gives off a number of 

 small branches. As the nerve leaves the ganglion (from its very 

 base or from the ganglion itself) a small nerve passes ventrally 

 immediately into the levator quadrati muscle. 



From the lateral border of the nerve trunk are two small 

 branches given off to the anterior and posterior masseter muscles. 

 A branch, given off from the anterior medial border, runs pos- 

 teriorly into the pterygoid muscle (figs. 25, 26, 44, pi.). A 

 .short distance dorsal to the lower bony jaw there is given off, 

 from the anterior border of the nerve, a somatic sensory branch 

 to the skin in the region of the angle of the mouth. From the 

 Gasserian ganglion at the very base of the ramus mandibularis 

 a motor branch passes out which runs anteriorly along the dorsal 

 border of the masseter muscle (fig. 24, 23, md.l). When the 

 level is reached where the ramus maxillaris leaves the anterior 

 end of the Gasserian ganglion this small nerve applies itself to 

 the ventral border of the ramus maxillaris and divides into two 

 parts (fig. 44), one running along the medial and the other 

 along the lateral border of the ramus. Both nerves soon leave 

 the maxillary trunk, the lateral one innervating the anterior 

 masseter, the medial one supplying the temporalis and farther 

 anteriorly the preorbital head of the latter muscle (figs. 21, 20,. 

 16-14, md.l, tmpro.). Leaving the latter muscle, the medial 

 nerve, at a level slightly anterior to the origin of the retractor 

 muscle of the tentacle, curves dorsally around the medial border 

 of the tentacular muscle to enter and innervate the compressor 

 muscle of the orbital gland (fig. 16, md.l, ego.). This nerve, 

 7nd.l, is probably the one mistaken by Waldschmidt for an anas- 

 tomosis between the oculomotorius and the ramus maxillaris V. 

 It was doubtless this same small nerve which Wiedershemi de- 

 scribed as derived from the ramus maxillaris and innervating 

 mm. masseter and compressor of the orbital gland. 



