File:MartinFalkiner1938 plate01.jpg

Plate 1

1 Section 31 D. X 38.

2 Section 29 A. X 150. The large amniotic cavity lies dorsal and it is prolonged into the body stalk as the amniotic duct. The small cavity of the yolk sac is separated from the amnion by a considera.ble interval filled with loose tissue with deep grooves on either side. In the floor of the amniotic cavity the extreme edge of the embryonic p-late has been sectioned very obliquely. The allantois, though indistinct, can be seen in the body stalk.

3 Section 29 D. X 150. Two parts of the yolk sac cavity separated by a broad band of tissue are visible in this section. One small part lies fairly close under the embryonic plate; the other and larger lies more ventrally. This last is the compartment that was visible in previous sections. The allantois is cut in two places: first it is seen as a long duct running dorsally from the caudal end of the ventral compartment of the yolk sac, and secondly it is again c.ut slightly caudal to the dorsal end of the duct-like part. From the dorsal end of the longitudinal part a wedge-shaped mass of cells projects toward the amniotic cavity.

4 Section 29 F. X 150. The two compartments of the yolk sac are fusing in this section. The allantois is still visible in the body stalk. The amnion has been torn. Two grooves constrict the outside of the yolk sac, and the endoderm in the roof of the sac between these grooves is irregular and much folded, while that below the grooves forms an even regular layer.

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  Fig. 2

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  Fig. 3

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  Fig. 4

Reference

Martin CP. and Falkiner N. Mcl. The Falkiner ovum. (1938) Amer. J Anat., 63: 251-271.

Cite this page: Hill, M.A. (2024, April 27) Embryology MartinFalkiner1938 plate01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:MartinFalkiner1938_plate01.jpg

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