File:Arey1924 fig054.jpg: Difference between revisions

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Fig. 54. Scheme of placental circulation

(Kollmann)

Arrows indicate the blood flow in the intervillous spaces.

The maternal arteries and veins pass through the basal plate, taking a sinuous course and opening into the intervillous spaces (Fig. 54). Near their entrance they proceed obliquety and lose all but their endothelial layers. The original openings of the vessels into the intervillous spaces were formed during the implantation of the ovum when their walls were eroded by the invading trophoderm of the villi (Fig. 47). As the placenta increases in size, the vessels grow larger. The ends of the villi frequently are sucked into the veins and interfere with the placental circulation.

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Reference

Arey LB. Developmental Anatomy. (1924) W.B. Saunders Company, Philadelphia.

Cite this page: Hill, M.A. (2026, October 6) Embryology Arey1924 fig054.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Arey1924_fig054.jpg

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+==Fig. 54. Scheme of placental circulation==
+(Kollmann)
+Arrows indicate the blood flow in the intervillous spaces.
+The maternal arteries and veins pass through the basal plate, taking a sinuous course and opening into the intervillous spaces (Fig. 54). Near their entrance they proceed obliquety and lose all but their endothelial layers. The original openings of the vessels into the intervillous spaces were formed during the implantation of the ovum when their walls were eroded by the invading trophoderm of the villi ([[:File:Arey1924 fig047.jpg|Fig. 47]]). As the placenta increases in size, the vessels grow larger. The ends of the villi frequently are sucked into the veins and interfere with the placental circulation.
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