Paper - A human embryo of two to three pairs of somites: Difference between revisions
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A description is given of a human embryo with two to three pairs of somites and about 25 days old. In general the embryo tallies with the few other human embryos of the same stage hitherto described. It has a well developed head fold, but no tail fold. Its neural groove is everywhere open. There is a minute neurenteric canal, a long primitive streak, and long cloacal membrane. The last is degenerate in its caudal part. The optic primordium is faint, but a clear otic placode is present. Between the two extends a neural crest, the earliest on record. A slight fore-gut is present, ending in an oral membrane. There is a long tubular allantois. The notochord is strap-like, issuing from a Henson's node and ending in a prechordal plate. Two well developed pairs of somites appear with the beginning of a third. The mesoderm is split to contain two body cavities, which join beneath the fore-gut. The yolk sac is partly covered with blood islands. There are two definite umbilical arteries and traces of umbilical veins. Solid strands of angioblastic tissue beneath the fore-gut are the only signs of a heart. Scattered indications of body vessels also occur. | |||
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Revision as of 12:29, 30 July 2017
Embryology - 7 May 2024    Expand to Translate
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Shaner RF. A human embryo of two to three pairs of somites. (1945) Canad. J. Res. 23: 235-243.
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A Human Embryo of Two to Three Pairs of Somites
Currently only a template page.
A description is given of a human embryo with two to three pairs of somites and about 25 days old. In general the embryo tallies with the few other human embryos of the same stage hitherto described. It has a well developed head fold, but no tail fold. Its neural groove is everywhere open. There is a minute neurenteric canal, a long primitive streak, and long cloacal membrane. The last is degenerate in its caudal part. The optic primordium is faint, but a clear otic placode is present. Between the two extends a neural crest, the earliest on record. A slight fore-gut is present, ending in an oral membrane. There is a long tubular allantois. The notochord is strap-like, issuing from a Henson's node and ending in a prechordal plate. Two well developed pairs of somites appear with the beginning of a third. The mesoderm is split to contain two body cavities, which join beneath the fore-gut. The yolk sac is partly covered with blood islands. There are two definite umbilical arteries and traces of umbilical veins. Solid strands of angioblastic tissue beneath the fore-gut are the only signs of a heart. Scattered indications of body vessels also occur.
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Cite this page: Hill, M.A. (2024, May 7) Embryology Paper - A human embryo of two to three pairs of somites. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_A_human_embryo_of_two_to_three_pairs_of_somites
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
