796 



MAN 



pre-olivary sulcus separates tin- pyianiicl from a promiiicnl ()li\ai"y eminence. 

 A distinct postolixary sulcus uiter\enes between the olixary body and the 

 spinocerebenar t'niinence, tlie expression of which latter is delimited dorsally 



?^A^ ' .J 



FIG. 340. \'ENTRAL SL KFACE OF B AIN STEM, HOMO SAPIENS. 



lActvial Length 82 mm.] 



Key to DiM.uwi. op. dr.. Optic Chiasm; o. N., Optic Nerve; opt. ped. sp..\ce, Opticopeduncular Space; 

 1". H. 1)1 (.., P\ramiclal Dcciis.sation; VENT. .MED. sll., Ventromedial Sulcus. 



In- a well-delined intermediate sulcus. The most strikin<i; feature on the ventral 

 surface of the brain stem in man is the markt'd prominence oi the pons. This 

 structure lias gained in all dimensions. It is separated from tin- oblongata by 

 the bulbopont lie sulcus. 



The cert'bral peduiules, like the jjons X'arolii, are strikingly j)rominent 

 in man. The\ are longer and more marked in tlu'ir surface relief. All ol 

 the features u|)on the xfiitral surface of the brain stem, including more 

 particularly the prominence of the p\ramld, the pons Varolii and the cere- 



