File:Streeter1920 Plate 1.jpg

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Plate 1 Presomite Embryo

Fig. 5. Frontal view of wax-plate reconstruction of Mateer embryo, showing yolk-sac and embryonic plate outlined by the cut edge of the amnion, which is shown as removed. The stump of the body-stalk can be seen with the allantois at its center. Extending forward from the caudal end of the embryonic plate is a well-defined primitive groove. Enlarged 60 diameters.

Fig. 6. Median view of wax-plate reconstruction of Mateer embryo showing the form of the amniotic cavity and its relation to the chorionic membrane and the yolk-sac. The allantois projects through the body-stalk and is interrupted near its center. In the loose tissue caudal to the body-stalk is an epithelial mass constituting the amniotic vesicle of the twin embryo. Enlarged &) diameters.

Fig. 7. Photograph of section through embryo No. 763, Carnegie Collection. This specimen would belong among those in our group 1 having branched villi. The embryo, consisting of two vesicles, can be seen in the center. The series being incomplete, the definite form of the embryo can not be made out. This specimen is distinctly younger than the Mateer specimen and its viUi are to be compared with those in figure 8. Enlarged 30 diameters.

Fig. 8. Photograph of a typical larger villus of the Mateer specimen, showing transition into trophoblast. For a detail of these structures see text-figure 4. Enlarged 50 diameters.


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Reference

Streeter GL. A human embryo (Mateer) of the pre-somite period. (1920) Contrib. Embryol., Carnegie Inst. Wash. Publ. 272, 9: 389-424.



Cite this page: Hill, M.A. (2024, April 19) Embryology Streeter1920 Plate 1.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Streeter1920_Plate_1.jpg

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