B.V. 



P.M. 



Fig. 209. — Pineal Evagination, 20-MM. Human Embyro. The Section 

 passes transversely through the posterior part of the diverticulum., 

 where its Lumen is continuous with the Cavity of the Third Ventricle. 

 B.V. : blood-vessels. N.Z. : nuclear zone. 



Ep. Z. : ependymal zone. M.Z. : marginal zone. 



P.M. : pia mater. 







JBK^&N 





^ - 



($ 



U; 







Ewrf.S. 



hum. 



B.V. 



Th, 



Fig. 210. — Pineal Organ of the Same Embryo as Fig. 209. The Section 

 passes transversely through the anterior part of the organ, and 

 shows the Central Lumen surrounded by Radially Arranged Ependymal 

 Cells. (R. J. G.) 



B.V. : blood-vessel. Ep. : ependyma. End. S. : endothelium-lined space. 

 hum. : lumen. Th. : thalamencephalon. 



