396 ^ ^1- I'OLLARb, 



It takes the course described by van Wijhe but also gives from its 

 anterior brauch a twig which passes through the ectethmoid into the 

 nasal capsule. 



Abducens and Facial groups. 



The Abducens arises from the base of the medulla oblongata and 

 enters a small canal in the basal cartilage of the skull, which however 

 it leaves within the skull, taking its exit with the Trigeminus. It 

 lies very close to the Gasserian but does not enter into any relation 

 with it. 



The Facial is a very large nerve. 



The following branchs may be distinguished: 



(1) Ramus ophthalmicus superficialis s. frontalis with R. oticus. 



(2) Ramus buccalis. 



(3) Nerves to the postorbital mucous canal. 



(4) Ramus mandibularis. 



(5) Ramus hyoideus s. jugularis. 



(6) Ramus palatinus s. petrosus superficialis major. 



The Ramus ophthalmicus superficialis (fig. 9) in the ectethmoid 

 canal anastomoses with the median branch of the Ramus ophthalmicus 

 profundus and gives off first a branch (1) supplying the dermal nasal, 

 then (2) another branch which supplies one mucous ampulla and some 

 portion of the skin. It then (3) dips into the nasal capsule reappear- 

 ing to supply another ampulla above the anterior part of the snout 

 and an ampulla in the Os terminale. It does not supply the median 

 ethmoid mucous canal. 



The Ramus buccalis passes downwards from the ganglion and 

 under the eye forms one trunk with the maxillaris superior. Before 

 doing so however it gives off a small branch to the postorbital mucous 

 canal and a long branch supplying the mucous canal in the maxilla. 

 The common trunk of the buccalis and maxillaris superior gives off 

 branches to the mucous canal in the premaxilla and to the antorbiial 

 region. The main stem enters the nasal capsule previously receiving 

 a very fine commissure from the palatine through the outer cartilagi- 

 nous wall and lies on the floor of the nasal cavity. Beneath the nasal 

 opening it divids into 2 branches one of which penetrating the solid 

 anterior cartilaginous wall of the nose reaches the ethmoid mucous 

 canal (fig. 10), while the other supplies a mucous ampulla and the 

 tip of the snout giving also some twigs to the skin below the nasal 

 tentacle. 



