144 EDWARD PHELPS ALLIS, JR. 



fibers of the nerve and runs outward posterior to the levator 

 muscle of the arch, the rami medius and anticus running out- 

 ward anterior to that muscle. The ramus medius is closely 

 accompanied by the ramus pretrematicus externus of the first 

 vagus, and gives off a ramus posttrematicus internus; all of 

 these nerves having courses similar to those of the corresponding 

 nerves in the more posterior arches. 



The facialis-acusticus complex has a motor, a communis and 

 two lateralis roots, and a fifth root, which is small, arises between 

 the motor and the posterior one of the two lateralis roots and is 

 quite certainly general sensory, though this could not be defi- 

 nitely established. The communis root immediately separates 

 into two parts, and on these two parts, and on the two lateralis 

 roots, a large intracranial ganglion forms, the communis part of 

 the ganglion lying ventral to the lateralis one. From the an- 

 terior portion of the ganglion the rami oticus, buccalis, and 

 ophthalmicus superficialis arise, all of them containing both 

 lateralis and communis fibers, and if these nerves belong to the 

 nervus trigeminus, as I believe, the anterior lateralis root, and 

 the anterior portion of the communis root, mast also belong to 

 that nerve. Communis fibers, but no lateralis ones, are also 

 sent from the anterior portion of the ganglion to the rami man- 

 dibularis and maxillaris trigemini. From about the middle of 

 the length of the ganglion the ramus palatinus facialis arises, 

 composed entirely of communis fibers, and from its posterior 

 portion both lateralis and communis fibers are sent to the nervus 

 hyomandibularis facialis. From the posterior one of the two 

 lateralis roots, close to its base, the nervus acusticus arises, and 

 receives a bundle of fibers from the sniall and apparently general 

 sensory root, the acusticus thus apparently corresponding, in 

 its relations to the nervus facialis, to the rami supratemporales 

 of the glossopharyngeus and vagus nerves. The remainder 

 of the small and apparently general sensory root then, in three 

 out of four cases examined, runs through the ventral portion of 

 the lateralis-communis ganglion into the ramus hyomandibularis 

 facialis, while in the fourth instance a part, only, of the nerve has 

 that course, the remainder turning forward in the ganglion and 

 there being lost. 



