33* 



THE MORPHOGENESIS OF THE CENTRAL NERVOUS SYSTEM 



network of blood-vessels and produce an important internal secretion. Pari 

 passu with the differentiation of the anterior lobe the infundibular anlage of the 



Dienapliahn 

 (Inltr-brai,,) 



Pined body cpilhalamus 



Lamina terminal's / Hypothalamus 

 (Olfactory-brain) 



Spinal cord 

 Central canal 



FIG. 324. Median sagittal section of the brain from a fetus of the third month 

 (His from Sobotta's Atlas). 



Pallium 



Foramen Monroi 



Third ventricle 



Optic vesicle 

 Ltns vesicle 



Infundibulum 



e's pocfah . 



FIG. 325. Oblique transverse section through the diencephalon and telencephalon of a 10 mm. embryo. 



X 61. 



posterior lobe loses its cavity, but the walls of the infundibulum persist as its 

 solid permanent stalk. The lobe enlarges and its cells are differentiated into a 



