458 NERVOUS SYSTEM. 



buted by several filaments upon the lachrymal gland, the upper 

 eyelid, and some of them reach the conjunctiva. 



Second Branch of the Trigeminus. 



The Second Branch of the Fifth Pair, (JVervus Maxillaris 

 Superior,) arising from the middle of the plexus gangliformis, 

 or ganglion of Gasser, and also, in part, from the common 

 trunk formed from the anterior and posterior roots of the tri- 

 geminus, gets from the cranium through the foramen rotun- 

 dum of the sphenoid bone. While still in the cranium it 

 sometimes forms an anastomosis, described by Laumonier, 

 with the beginning of the sympathetic nerve, but generally it 

 does not detach any filament till it reaches the pterygo-max- 

 illary fossa. 



At a short distance after its exit from the cranium, it gives 

 off a small filament, the Nervus Subcutaneus Malae, which as- 

 cends into the orbit through the spheno-maxillary fissure, and 

 then divides. One of the branches, the malar, anastomoses 

 with the lachrymal nerve, and leaves filaments with the lachry- 

 mal gland; it then gets, by one or more filaments, through the 

 holes of the malar bone to the face, and terminates on the or- 

 bicularis muscle and the skin of the cheek, anastomosing with 

 the extremities of the facial nerve. The other branch, the 

 temporal, gets into the temporal fossa by penetrating the 

 internal part of the malar bone, and, having anastomosed 

 with a branch of the inferior maxillary nerve, it goes out- 

 wards and backwards, becomes superficial by penetrating the 

 temporal aponeurosis, and terminates on the integuments of 

 the temple, anastomosing there with the branches of the facial 1 

 nerve. 



The superior maxillary then divides into two trunks much 

 larger than the preceding, and of a volume nearly equal; the 

 Infra-Orbital and the Pterygo-Palatine. 



The Infra-Orbital (JVervus Infra-Orbitalis) passes forwards, 

 with a slight ascent, to the posterior part of the orbit, and en- 

 ters the infra-orbitar canal. As it is about engaging in the' 

 latter, it detaches a considerable branch, the Posterior Den- 



