ORIGIN OF THE CEREBRAL NERVES. 503 



peduncle, as well as external to it (Clarke, Dean), (fig. 255, 

 on the left side, B). The large cells of the external auditory 

 nucleus are continuous, according to Clarke, both with the 

 surrounding transverse sections and the trellis-work. 



3. From the transverse sections of the restiform body (fig. 

 255, St). 



4. From the anterior auditory nucleus (Stilling), which is 

 again the medium of communication with the medulla of the 

 cerebellum (fig. 255, 8 2 ). To the posterior auditory root unite 

 themselves 



5. Superficial fasciculi, the strice medullares which cover 

 the internal auditory nucleus and the crus cerebelli. Proceed- 

 ing from the internal division of the opposite cerebellar 

 peduncle, they pass forwards through fibrse arcuatse that near 

 the raphe curve backwards and extend through their struc- 

 ture to the surface of the floors of the fourth ventricle. 



6. The deep-lying fasciculi of the external root cover the 

 peduncle of the cerebellum of the side on which they emerge, 

 but not the grey floor; for although they behave themselves to 

 the side of their origin like the fasciculi of the medullary striae 

 they do not run back in the raphe quite to the surface of the 

 grey floor. The posterior of these superficial fasciculi traverse 

 the whole of the internal auditory nucleus, extending nearly to 

 the median groove. The anterior fasciculi, however, leave the 

 raphe' before reaching the grey floor, so that they form fibrae 

 arcuatse on the side on which the root emerges, which cut 

 through the anterior angle of the auditory nucleus, and extend 

 backwards in the grey substance of this nucleus close to the 

 internal border of the crus cerebelli. Between the most posterior 

 transverse sections of the internal division of the crus cerebelli 

 they pass outwards, and run with the remaining fasciculi of the 

 posterior root over the restiform body (fig. 257, the fasciculi 

 between x and x 1 and those behind 8 F C). 



Another fascicular portion of the external root, lastly, accord- 

 ing to the accurate statements of Clarke and Dean, traverses 

 the restiform body instead of encircling it. This portion may 

 not improbably proceed by means of arcuate fasciculi from the 

 opposite internal division of the cerebellar peduncle. Like the 

 auditory nucleus itself, the arcuate fasciculi and radial fibres 



