File:Jenkinson1913 fig149.jpg

Fig. 149. Five stages in the formation of the placenta in the mouse

A, The blastocyst free in the uterus.

B, The blastocyst attached and the placental thickening of the a1lantoidean trophoblast developed (a.tr.).

C, Later stage, after elosure of the amniotic cavity (am.c.).

D, The foetal blood-vessels beginning to penetrate the allantoidean trophoblast.

E, Elaboration of the placenta. Disappearance of the distal Wall of the yolk-sac and omphaloidean trophoblast (o.tr.).

l’.u’., new uterine lumen on the antimesometrie side; l.u., original lumen of the uterus ; 3/.s., yolk-sac ; g/.st. yolkstalk ; u.c., umbilical cord; m., mesometrium.

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Reference

Jenkinson JW. Vertebrate Embryology. (1913) Oxford University Press, London.

Cite this page: Hill, M.A. (2024, April 26) Embryology Jenkinson1913 fig149.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Jenkinson1913_fig149.jpg

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