Paper - The development of primordial and definitive amniotic cavities in early Rhesus monkey and human embryos
The development of primordial and definitive amniotic cavities in early Rhesus monkey and human embryos
Am J Anat. 1975 Oct;144(2):149-67.
Luckett WP.
Abstract
Re-examination of early rhesus monkey and human embryos in the collection of the Carnegie Institution of Washington suggests that the mechanism of amniogenesis in both is basically similar to that of the hedgehog and vespertilionid bats. A primordial amniotic cavity develops by cavitation within the embryonic mass of 10-day rhesus monkey, and 7-day human, blastocysts. This primordial cavity has no relationship initially with the overlying trophoblast, contrary to earlier reports. Subsequently, there is a thinning and peripheral spreading of the epiblastic roof of the primordial cavity, resulting in partial opening of the roof and formation of a slightly cupped embryonic disc. The resulting space is not homologous with the primordial amniotic cavity; instead, it is a transitory tropho-epiblastic cavity. The definitive amniotic epithelium forms by the upfolding and mitotic proliferation of the margins of the epiblastic disc; this process is completed in 11-day rhesus, and 9-day human, blastocysts. Amniogenesis by cavitation is associated with the persistence of polar trophoblast following implantation, and it is suggested that this cavitation process may be essential for providing a free epithelial surface for the morphogenetic movement of epiblastic cells during subsequent formation of the primitive streak.
PMID 810017 DOI: 10.1002/aja.1001440204
See also Luckett WP. Origin and differentiation of the yolk sac and extraembryonic mesoderm in presomite human and rhesus monkey embryos. (1978) Amer. J Anat., 152: 59-97. PMID 98035
Cite this page: Hill, M.A. (2024, April 27) Embryology Paper - The development of primordial and definitive amniotic cavities in early Rhesus monkey and human embryos. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_The_development_of_primordial_and_definitive_amniotic_cavities_in_early_Rhesus_monkey_and_human_embryos
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