File:Heuser-1940 text-fig01.jpg

Text Fig. 1 Drawing of a graphic reconstruction from serial photographs

Fig.1 Drawing of a graphic reconstruction from serial photographs representing a section of the ovum passing through the mid—sagittal plane of the embryo proper.

The positions of the sections shown in plates 1, 2 and 3 are indicated by arrows. Since the embryo lies eccentrically in the chorion, as shown in figure 4, the reconstruction does not cut through the maximum width of the ovum. A few streamers of plasmoditrophoblast are cut beyond their connection with the ovum and appear detached in the drawing. A part of the ovum is not covered with uterine epithelium. The exposed area, is about 0.0375 sq.mm. or about 2% of the total surface of the chorion.

The trophoblast is enveloping a large uterine gland. Some of the glandular epithelium has been cytolyzed and other parts show stages of disintegration. The amniotic cavity is a. narrow space between the embryo and the amniogenic cells, diiferentiating from the cytotrophoblast. A small diverticulum near the caudal end of the embryo probably is the beginning of an amniotic duct.

Reference

Heuser CH. The chimpanzee ovum in the early stages of implantation (about 10.5 days). (1940) J Morphol. : 155- .

Cite this page: Hill, M.A. (2024, April 25) Embryology Heuser-1940 text-fig01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Heuser-1940_text-fig01.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G