340 



THE MORPHOGENESIS O7 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 sfl 

 Telencephalon / 



Thalamus 



..----^^ I Pineal body (epithalamus) 

 Cerebral peduncle 

 ' Cerebral aqueduct 

 * Mesencephalon 



Pans 



Optic Hypo- 

 ichiasma physis MeJulla. 



Lamina terminalis / Hypothalamus oblon z ata 

 Rhinencephalon 



i - Isthmus 

 - Cerebellum 

 " Metencephalon 

 Rhomboid fossa 

 - Myelencephalon 



""* Spinal cord 

 Central canal 



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



Pallium 



Foramen Monroi 



Third ventricle 



Optic vesicle 

 Lens ves 



Infundibulum' 



Rathke's pouch' 



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 



