File:Dalton1858 fig01.jpg

Placenta

At a.a. is seen the chorion receiving the umbilical vessels from the body of the foetus through the umbilical cord, and sending out its compound and ramified vascular tufts into the substance of the placenta. At b. b. is the attached surface of the decidua, or uterine mucous membrane; and at c. c. c. c. are the orifices of uterine vessels which penetrate it from below. These vessels enter the placenta in an extremely oblique direction, though they are represented in the diagram, for the sake of distinctness, as nearly perpendicular. When they have once penetrated, however, the lower portion of the decidua, they immediately dilate into the placental sinuses, which extend through t 3 entire thickness of the organ, closely embracing all the ramifications of the foetal tufts.

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Reference

Dalton JC. Anatomy of the placenta. (1858) American Medical Monthly. 1-13.

Cite this page: Hill, M.A. (2024, April 28) Embryology Dalton1858 fig01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Dalton1858_fig01.jpg

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