THE SEVENTH NERVE 



345 



sphenoidal fissure between the two heads of the external rectus; 

 it receives a branch from the ophthalmic nerve, and supplies 

 the above-named muscles. 



Frontal. 

 TrocMear. 



FIG. 60 

 Ltacrimal 



f , 



^-^^^ /"Superior division of ocido-motor, 

 /Nasal. 



Inferior division of oculo-motor. 

 ^Abducent. 

 Ophthalmic vein. 



Relations of structures passing through the sphenoidal fissure. (Gray.) 



The Seventh Nerve 



The seventh or facial has a superficial origin from the depres- 

 sion between the olivary and restiform bodies, and a deep 

 from the fasciculus teres. Between it and the eighth is the pars 

 intermedia, which joins the facial in the auditory canal. The 

 nerve runs outward to the internal meatus, where it runs in a 

 groove on the auditory nerve, enters the aquseductus Fallopii, 

 and emerges at the stylomastoid foramen. It presents within 

 the aqueduct, near the hiatus Fallopii, a reddish enlargement, 

 the genfculate ganglion. Outside the cranium it runs forward 

 in the parotid gland, and divides behind the ramus into the 

 cervicofacial and temporofacial divisions. In the parotid and 

 vicinity the radiating branches form the pes anserinus. 



Communicating Branches. In the internal auditory meatus, 

 one or two, communicating with auditory nerve. 



In the aqueduct it communicates with Meckel's ganglion by 

 means of the large superficial petrosal; with the otic ganglion by 

 a small branch to the small superficial petrosal; with the sym- 

 pathetic, on the middle meningeal, by the external petrosal; and 

 with the pneumogastric (auricular branch). 



