140 



LECTURES ON THE CENTRAL NERVOUS SYSTEM. 



nucleus globosus, the embolus, and external to these the plicated 

 medullary lamina of the nucleus dentatus. The deep indenta- 

 tions in the surface mark the position of the fissures between the 

 lobes. Between the anterior peduncles (R R) lies, as I before 

 stated, the lingula on the velum medullare anticum : it is also 

 cut through in a horizontal direction ( A). 



All the nuclei which you see in the white substance are 

 connected with each other by bands of gray matter. Their 

 relations to the fibres of the white substance are almost totally 



'an 



K 



FIG. 84. 



Section just in front of the eulmen, passing in a frontal direction through the 

 cerebellum. U*, fourth ventricle. R, superior cerebellar peduncle. /, pons. Zon, 

 decussational zone; internal to it lie the fibres of the fleece. Cr, bundles from the 

 restif orm body pass over into the fibrse semicirculares, Sem. 8, region of exit of root 

 of trigeminus. (After B. Stilling.) 



unknown. If a frontal section is made just in front of the 

 point where the peduncles enter the cerebellum, then dorsad of 

 its plane will be the cerebellum, and ventrad of it will be the 

 pons and the fibres which pass from it on both sides into the 

 hemispheres. Between the cerebellum and the tegmentum lies 

 the fourth ventricle, bounded on each side by the divided pe- 

 duncles. This is the continuation of the aqueduct of Sylvius. 

 The white substance of the vermis does not fall into the plane 



