94 



GENERAL ANATOMY. 



Fig. 54.' 



c 



Pingrams to phow the development of the three blastodermic layers on antero-po?terior sections. A. por- 

 tion of ovum with the vitelline membrane and germinal area. B C D E F. Various stages of development. 

 Q. Ovum in the uterus and formation of decidua. 1. Vitelline membrane. 2. External blastoderuiic laj er. 

 2'. Vesk-ula serosa. 3. Middle blustodermio layer. 4. Internal layer. 5. Vestige of the future embryo. 

 6. Cephalic flexure of the aranion. 7. Caudal flexure. 8. Spot where the nmnion and vesicula serosa are 

 Continuous. 8'. Posterior umbilicus. 9. Curdiao cavity. 10. External fibrous layer of the umbilical vesicle. 

 11. External fibrous layer of the amnion. 12. Internal layer of the blastoderm forming the intestine. 13. 

 14. External layer of the allantois, extending to the inner surface of the vesicula serosa. 15. The same now 

 completely applied to the inner pur face of the vesicula geros.a. 16. Umbilical cord. 17. Umbilical vessels. 

 18. Amnion. 19. Chorion. 20. Foetal placenta. 21. Mucous membrane of uterus. 22. Maternal pla- 

 centa. 2-'i. Deoidin reflexa. 24. Muscular w:ill of uterus. 



The same note applies to this as to the preceding diagram. 



