138 MAMMALIA. 



from the annular tubercle. It communicates with the vestibular division of the soft 

 portion in the internal auditory meatus in the calf; after it has left this, it receives 

 the cord of the tympanum, and sends a branch to join the trunk of the par vagum, 

 but it does not receive a branch of the Vidian nerve as in man and the monkey; 

 this deficiency may, however, be supplied by the filaments of the sympathetic, which 

 pass on the outer surface of the labyrinth. The branch sent to the par vagum 

 in the goat, forms a ganglion at the point of union with this nerve. After it has 

 escaped from its foramen, it is large and of a different size in various animals ; in the 

 baboon and monkey its distribution is very similar to that in man, but the branches 

 are smaller ; it gives a branch to the superior belly of the digastric muscle, and to a 

 slender one like the stylo-hyoideal in the baboon and dog. In the dog it sends a 

 branch to pierce the cartilaginous portion of the tube of the external auditory meatus, 

 and terminates on the skin. It gives branches to communicate with others of the 

 first cervical nerve, to terminate on the cutaneous muscle of the neck and skin of the 

 auricle. It gives off a branch which becomes connected with the superficial temporal 

 branch of the third trunk of the fifth, to be distributed on the muscles of the external 

 ear. It then divides into three principal branches, the temporal passes over the eye- 

 brow to the cutaneous muscle of the forehead and nose, gives filaments to the orbicular 

 muscle of the eye-lids, and communicates with the temporal and malar branches of the 

 malar and supra-orbital nerves. The middle branch passes towards the upper jaw, 

 and communicates with branches of the buccal nerve and the second trunk of the fifth, 

 and terminates on the muscles of the middle portion of the face and the upper lip ; the 

 inferior branch extends towards the lower jaw, communicates with the buccal and the 

 mylo-hyoideal branch of the inferior dental, and then communicates with branches of 

 the inferior maxillary nerve on the chin, and gives branches to the muscles of the face 

 and lower lip. In the pig, after giving branches to the salivary glands and surrounding 

 parts, it divides into three principal branches : the temporal is the smallest ; one part 

 of it passes over the eye-brow, the other communicates with the auricular branch of 

 the third trunk of the fifth, and supplies the more anterior muscles of the external ear ; 

 it sends also a large branch backwards to the more posterior muscles of this part. 



