45 6 



THE BRAIN 



build up are divided) to determine precisely the number of 

 fila which belong to each. From below upwards the nerves 

 which they form are the accessory, the vagus, and the glosso- 

 pharyngeaL The fila of the vagus and the glosso-pharyngeal 

 are much more closely crowded together than those of the 

 accessory. 



The roots of the accessory, which spring from the medulla 

 oblongata, constitute only one part of the nerve. The spinal 



Oculomotor nerve 



Trochlear nerve 



Sensory root of the trigeminal nerve 

 Motor root of the trigeminal 

 nerve 



Abducent nerve 



root of facial 

 nerve 



Cut edge of the 

 tentorium 



-Sensory root of 

 facial nerve 

 Acustic nerve 



Right transverse 

 sinus 



osso-pharyngeal 

 nerve 

 Vagus nerve 



Accessory nerve 



Vertebral artery 

 Hypoglossal nerve 

 First spinal nerve 

 Accessory nerve 



FIG. 184. Section through the Head a little to the right of the Median 

 Plane. It shows the posterior cranial fossa and the upper part of the 

 vertebral canal after the removal of brain and the spinal medulla. 



part springs from the spinal medulla, as low down as the sixth 

 cervical nerve, by a series of roots which issue from the lateral 

 funiculus, posterior to the attachment of the ligamentum 

 denticulatum. 



Acustic and Facial Nerves. These issue close together 

 at the lower border of the pons, and immediately above the 

 restiform body. The acustic nerve is the larger of the two, 

 and it lies on the lateral side of the facial. Its two roots, 

 termed the cochlear and the vestibular, embrace the restiform 

 body. 



