File:Odgers1935 plate02.jpg

Plate II

1. A microphotograph of the septum primum in a 6-5-mm. embryo ( x 124). This is four sections above the foramen primum and shows that the larger dorsal myocardial proliferation is meeting a much smaller cone-shaped ventral one.

Figs. 2-10. These are all microphotographs of the septum primum in a 7 -1-mm. embryo ( x 124).

The dorsal wall of the auricle is towards the top of the page. Fig. 2 shows that the dorsal myocardial proliferation has not quite reached the ventral end of the septum but is in contact with a small ventral outgrowth to the left of it. In the next section (fig. 3) the septum just fails to meet the ventral wall and in two sections below this last (fig. 4) contact is only maintained by some proliferating endocardium. The succeeding two sections (figs. 5 and 6) show no contact at all between the two outgrowths; thisisthe foramen secundum. In figs. 7 and 8 which represent the next section and the next but one below the last, contact is again made by the two out growths, but in the next alternate sections (figs.'9 and 10) the ventral proliferation is seen to gradually fail and the foramen primum thus begins.

Reference

Odgers PNB. The formation of the venous valves, the foramen secundum and the septum secundum in the human heart. (1935) J. Anat., 69: 412-422. PMID 17104548

Cite this page: Hill, M.A. (2024, April 28) Embryology Odgers1935 plate02.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Odgers1935_plate02.jpg

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