File:Brewer1937 plate03.jpg

From Embryology

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Plate 3

5 The blastocyst is entirely surrounded by short villi. The villi are most numerous on the basal side. The embryonic anlage is attached to the most dependent pole. The amnion is larger than the yolk sac. The embryonic plate is a simple, flat structure without distinctive surface markings. There is a condensation of cells in the region of the body stalk. The large basal and lateral. sinuses surround the blastocyst almost completely. The coagulum on the surface overlies the surface epithelium. It consists of blood and some fetal and maternal cells. The depression in the central portion is the point of entrance. Section 23-1-4. x 27.5.

6 This portion of the chorionic wall shows two short villi. with mesodermal cores. The Langhans cells extend out beyond the entl of the villus and join with those from the neighboring villi. The syncytiiun resembles the so-called primary syncytiunl. Maternal blood is found in the spaces between the fetal tissues. X 180.8.

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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)
Links: plate 1 | fig 1 | fig 2 | fig 3 | plate 2 | fig 4 | plate 3 | fig 5 | fig 6 | plate 4 | fig 7 | fig 8 | fig 9 | fig 10 | plate 5 | plate 6 | plate 7 | plate 8 | plate 9 | plate 10 | plate 11 | plate 12 | plate 13 | plate 14 | fig 11 | 1937 Brewer | Historic Papers | Carnegie Embryo 8819 | Carnegie stage 6 | Week 2


Brewer JI. A normal human ovum in a stage preceding the primitive streak (The Edwards-Jones-Brewer ovum). (1937) Amer. J Anat., 61: 429-481.

Cite this page: Hill, M.A. (2024, February 26) Embryology Brewer1937 plate03.jpg. Retrieved from

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