394 



THE BRAIN 



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 (Fig. 150). 



The roots of the accessory which spring from the medulla 

 oblongata constitute only one part of the nerve. The spinal 

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



Trochlear nerve 



Sensory root of the trigeminal nerve 

 / Motor root of the trigeminal 



Oculo-motor nerve 



Abd 



ngemi 



ucens nerve 

 Motor root of facial 

 erve 



Cut edge of the 



tentorium 



Sensory root of 

 ,/ facial nerve 

 "'--Acoustic nerve 

 Right transverse 



Glosso-pharyngeal 

 nerve 

 Vagus nerve 



Accessory nerve 



Vertebral artery 

 Hypoglossal nerve 

 First spinal nerve 

 Accessory nerve 



FIG. 151. 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. 



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

 funiculus, posterior to the attachment of the ligamentum 

 denticulatum (p. 83) (Figs. 149, 151). 



Nervus Acusticus et Nervus Facialis. The acoustic and 

 facial nerves are attached, close together, at the lower border of 

 the pons, and immediately above the restiform body, which 

 extends from the medulla oblongata to the cerebellum 

 (p. 479) (Figs. 150, 151). The acoustic nerve is the larger 

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

 Its two roots embrace the restiform body ; the dorsal of 



