Diencephalon 



Pallium 



Mesenccphalon 



Cephalic 

 flexure 



B 



Thai am us 



Pallium 



Optic 

 cup 



Pontine flexure 



Mydencephalon 



Meteti- 

 ccphalon 

 Corpus striatum 

 Optic recess 



Hypothalamus 



Mesencephulon 



Isthmus 



Cerebellum 



Medulla oblongata 



FIG. 15. DEVELOPING HUMAN BRAIN 

 From a 7 mm. embryo, showing the vesicles. 



A, lateral view; B, median sagittal section. The fore-brain consists of the telen- 

 cephalon (region labelled pallium) and diencephalon ; the mid-brain consists of the 

 mesencephalon, and the hind-brain of the metencephalon (cerebellum) and mye- 

 lencephalon (medulla oblongata). The portion of the fore-brain which becomes 

 the retina of the eye is indicated in A as the optic cup. 



From Prentiss and Arey, Embryology. 

 By permission of W. B. Saunders & Co. 



