Paper - Origin and differentiation of the yolk sac and extraembryonic mesoderm in presomite human and rhesus monkey embryos: Difference between revisions

Revision as of 11:18, 23 November 2016

Embryology - 1 Jun 2024 Expand to Translate
Google Translate - select your language from the list shown below (this will open a new external page)
العربية \| català \| 中文 \| 中國傳統的 \| français \| Deutsche \| עִברִית \| हिंदी \| bahasa Indonesia \| italiano \| 日本語 \| 한국어 \| မြန်မာ \| Pilipino \| Polskie \| português \| ਪੰਜਾਬੀ ਦੇ \| Română \| русский \| Español \| Swahili \| Svensk \| ไทย \| Türkçe \| اردو \| ייִדיש \| Tiếng Việt These external translations are automated and may not be accurate. (More? About Translations)

Luckett WP. The development of primordial and definitive amniotic cavities in early Rhesus monkey and human embryos. (1975) Amer. J Anat., 144(2):149-67. PMID 98035

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

Links: Placenta Development | Coelom Development

Cite this page: Hill, M.A. (2024, June 1) Embryology Paper - Origin and differentiation of the yolk sac and extraembryonic mesoderm in presomite human and rhesus monkey embryos. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_Origin_and_differentiation_of_the_yolk_sac_and_extraembryonic_mesoderm_in_presomite_human_and_rhesus_monkey_embryos

What Links Here?

Origin and differentiation of the yolk sac and extraembryonic mesoderm in presomite human and rhesus monkey embryos

Luckett WP.

Abstract

Reexamination of presomite human and rhesus monkey embryos in the Carnegie Collection provides no evidence to corroborate the hypothesis that the trophoblast is the source of all extraembryonic tissues in these embryos. Instead, the present study indicates that the developmental pattern of the yolk sac and extraembryonic mesoderm is homologous to that in other eutharian mammals. The primary yolk sac of 10- to 11-day human blastocysts is partially filled with a meshwork of extraembryonic endoderm, whereas such a meshwork is absent in the rhesus monkey. It is suggested that this endodermal meshwork develops as the result of interstitial implantation in the human embryo. A small secondary yolk sac develops in 12- to 13-day human and macaque embryos as the result of pinching off of a portion of the larger primary yolk sac. Development of a secondary yolk sac in higher primates appears to be related causally to differential rates of expansion of the blastocyst and primary yolk sac within the simplex uterus. The caudal margin of the primitive streak develops precociously in 12- to 14-day human and macaque embryos, and this appears to be the source of all the extraembryonic mesoderm of the chorion, chorionic villi, and body stalk. It is suggested that the peripheral spread of extraembryonic mesoderm plays in inductive role in the development of chorionic villi, similar to other types of epithelial-mesenchymal inductive interactions. In contrast to previous hypotheses, the human and macaque trophoblasts appear to give rise only to additional trophoblast.

PMID 98035 DOI: 10.1002/aja.1001520106

@@ Line 2: / Line 2: @@
 {{Ref-Luckett1975}}
+==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 {{Ref-Luckett1978}}
+:'''Links:''' [[Placenta Development]] | [[Coelom Development]]
+{{Footer}}
 ==Origin and differentiation of the yolk sac and extraembryonic mesoderm in presomite human and rhesus monkey embryos==
@@ Line 11: / Line 27: @@
 PMID 98035 DOI: 10.1002/aja.1001520106
 See also <pubmed>810017</pubmed>
-:'''Links:''' [[Placenta Development]] | [[Coelom Development]]
-{{Footer}}