288 



HUMAN ANATOMY. 



-Op.ck 



Su.lt &. in t 



DP* fc 





ZH- 



FIG. 132. 



Surface anatomy of the myelencephalon. (Roman numerals refer 

 to cranial nerves.) C. 1, first cervical spinal nerve; C. mam., corpus 

 mammillare; Op. n., optic nerve; Inf., infundibulum; Op. ch., optic 

 chiasm; Subs, int., substantia interpeduncu-geniculate body; Sub. b., 

 basilar sulcus; M. p. c., middle peduncle of cerebellum; F., flocculus; 

 F. h., horizontal fissure; O., olive; V. 1. s., ventrolateral sulcus; Pyr., 

 pyramid; V. m. f., ventral median fissure. (After Tan Oehuchtcn.) 

 (Whitehead.) 



fourth ventricle, and on either side, under the name of the cms 

 cerebelli, it passes to the cerebellum, forming its middle peduncle. 



CEREBELLUM. 



The cerebellum, or little brain, occupies the inferior occipital 

 fossae beneath the great cerebral lobes, from which it is separated 

 by the tentorium. Its average weight is a little over five ounces 

 in the male, and is proportioned to the greater brain about one 

 to twenty. It is oblong, flattened from above downward, and 



