390 



ANATOMY OF THE CENTBAL NEEVOTJS SYSTEM. 



other motor nerves of the eye and to the thalamus, there is here apparently a 

 well organized, synergetic apparatus, well deserving further experimental 

 research. 



Much less is known of the other branch of the eighth nerve, the nervus 

 vestibularis. It arises from ganglion-cells lying in the labyrinth and also in 

 the nerve-trunk itself. These cells send a small branch into the sensory 



Fig. 248. — Section through the region of the origin of the abducens. Origin 

 of the nervus vestibularis. 



epithelium in the ampulla, where it arborizes in extremely delicate filaments 

 around the base of the epithelium, and a second branch into the nerve. 



Of the two fasciculi converging to the acusticus, the anterior one is the 

 vestibular. It extends, median to the restiform body and the ascending 

 trigeminal root, dorsally through the medulla to the gray matter in the 

 floor of the fourth ventricle. A portion of its fibers ends there with terminal 

 branches in the dorsal nucleus. These fibers, just like the sensory spinal 



