340 



THE MORPHOGENESIS OF THE CENTRAL NERVOUS SYSTEM 



glandular cords of the anterior lobe. That portion of the wall between 

 the lumen and the neural lobe remains thin and constitutes the pars 

 intermedia. Recently, a further glandular portion, the pars tuberalis, 



Diencephalon. ._. 

 Chorioid plexus . , 



Corpus striatum 

 Telencephalon / 



Thalamus 



/ Pineal body (epithalamus) 



Cerebral peduncle 

 ' Cerebral aqueduct 

 * Mesencephalon 



" , 



Lamina terminal-is / 

 Rhinencephalon 



; Pans 



Optic Hypo- 

 cttiasma physis Medulla 



"H >T~ "* oblangafa 



Hypolhalamus 



' Spinal cord 

 "" Central canal 

 FIG. 342. Median sagittal section of the brain from a fetus of the third month (His in Sobotta). 



i - Isthmus 



- Cerebellum 

 ~~ Metencephalon 

 Rhomboid fossa 

 ~ Myelencephalon 



Pallium 



Foramen Monroi 



Third ventricle 



Optic vesicle- 

 Lens vesicle 



Infundibulum 

 Rathke's 



FIG. 343. Oblique transverse section through the diencephalon and telencephalon of a 10 mm 



embryo. X 61. 



has been recognized, lying along the tuber cinereum; it develops from the 

 fusion of paired lateral lobes, at the base and in front of Rathke's pouch. 

 The anlage of the neural lobe is transformed into a solid mass of neuroglia 



