SEVENTH PAIR — PORTIO DURA, OR FACIAL. 



497 



SIXTH PAIP. ABDUCENS, 



This is a nerve of motion, has its apparent origin close behind 

 the pons Varolii, at its junction with the inferior pyramids, and 

 its fibres can be traced to the inferior pyramids and lateral bundles 

 of the medulla. From its origin it passes forwards through the 

 foramen lacenim orbitale, in company with the third and the 

 ophthalmic branch of the fifth il^:ve3, aad is distiibuted to tht 

 abductor oculi, or external rectus, arid the external portign of the 

 retractor oculi muscles. 



Fio. 188. 



Left Bide of the f*ee— shoTring the listribution of the facial portions of the fifth and the seventh 

 nerves, a. Infraorbital ; 6, Masseter , c, Superior; d, Inferior branch of subzygomatic : c. An- 

 terior ; /, Middle ; g. Posterior auricular ; h h, Posterior temporal ; i Cervical branch ; k, Styioia 

 1 1 1, Parotid branches ; m, Facial ; n n' n". Its superior portion ; o. Its inferior portion. 



NTH PAIR PORTIO DTJBA, OS FACIAL. 



This nerve has its apparent origin in a depression in the 

 medulla oblongata between the olivary and restiform bodies ; its 

 deep origin can be traced to the floor of the fourth ventricle and 

 olivary fasciculus. From its origin it passes outwards, in company 

 with the eighth nerve, along with which it enters the meatus 

 auditorius internus, and thence into the aqueduct of Fallopius, 



■2k 



