NERVOUS SYSTEM. 113 



Sensory Root. Buccal nerve. 



Sympathetic Root. From, plexus on inferior maxillary artery. 

 Distribution. To tensor palati, tensor tympani, Eustachian 

 tube and pterygoid muscles. 



6th, or Abducens. 



Superficial Origin. From medulla, behind pons. 

 Deep Origin. From inferior pyramid and lateral tract of 

 medulla. 



Exit. With ophthalmic branch of fifth. 

 Distribution. To external rectus muscle of eye. 



7th, or Facial. 



Superficial Origin. From medulla, behind pons. 



Deep Origin. Floor of fourth ventricle. 



Exit. Through internal auditory meatus with eighth; enters 

 the aqueduct of Fallopius; has a ganglion developed on it, the 

 geniculate; passes out of the stylo-mastoid foramen to the muscles 

 of face and subcutaneous of neck. 



Branches. 



Great petrosal, to Meckel's ganglion. 

 Small petrosal, to otic. 

 Tympanic, to stapedius. 

 Chorda tympani, to tongue and mouth. 



Muscular, to occipito-styloid, digastric, stylo-hyoid and subcu- 

 taneous muscle of neck. 

 Auricular, to ear and face. 



8th, or Auditory. 



Superficial Origin. Restiform body. 



Deep Origin. Below seventh. 



Exit. With seventh, by cochlear and vestibular branches to ear. 



gth, or Glosso-pharyngeal. 



Superficial Origin. Medulla, below eighth. 

 Deep Origin. Floor of fourth ventricle. 

 Exit. By posterior foramen lacerum to back part of tongue 

 and pharynx. 



Branches. 



Jacobson's nerve (tympanic), carotid. 

 Communicating with sympathetic, pharyngeal. 



