374 DEVELOPMENT OF OEGANS IN MAMMALIA. [CHAP. 



Fig. 120. 



<^3 pui. 



pCLg. 



" (^y 



^irtS 



Longitudinal Vertical Section through the Anterior 

 Part of the Brain op an Embryo Rabbit of four 

 centimetres. (After Mihalkovics.) 



The section passes through the median line so that the cere- 

 bral hemispheres are not cut ; their position is however indicated 

 in outline. 



spt. septum lucidum formed by the coalescence of the inner walls 

 of part of the cerebral hemispheres ; cma. anterior com- 

 missure ; frx. vertical pillars of the fornix ; cal. genu of 

 corpus callosum ; trm. lamina terminalis ; hvns. cerebral 

 hemispheres ; olf. olfactory lobes ; ad. artery of corpus 

 callosum ; fmr. position of foramen of Monro ; chd 3. choroid 

 plexus of third ventricle ; pin. pineal gland ; cmp. posterior 

 commissure ; hgm. lamina uniting the lobes of the mid- 

 brain ; chin, optic chiasma ; hph. pituitary body ; inf. infun- 

 dibulum ; ptis. pons Varolii ; pde. cerebral peduncles ; agd. 

 iter a tertio ad quartum ventriculum. 



