1) Embryonic attachment
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https://www.crosswordclues.com/clue/yolk-sac
The yolk sac is a membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and mammals. It functions as the developmental circulatory system of the human embryo, before internal circulation begins. ==In humans== It is the first element seen in the gestational sac during pregnanc...
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http://en.wikipedia.org/wiki/Yolk_sac
The membrane-covered food pouch found on the belly of a newly hatched fish. It nourishes the growing fish until it is able to feed itself.
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http://english-fly-fishing-flies.s3-website-eu-west-1.amazonaws.com/glossar
(from the article `reproductive system, animal`) ...embryos hatch in an extremely undeveloped but self-sustaining state as few as eight hours after fertilization. The yolk mass is large in some ... ...may be enclosed in the formative cells of the embryo, the bulk of the yolk remains an uncleaved mass, overgrown and surrounded by the cel...
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http://www.britannica.com/eb/a-z/y/9
One of the protective membranes surrounding the embryo
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http://www.encyclo.co.uk/local/20415
<embryology, ornithology> One of the set of extra embryonic membranes, growing out from the gut over the yolk surface, in birds formed from the splanchnopleure, an outer layer of splanchnic mesoderm and an inner layer of endoderm. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973
the extraembryonic membrane connected with the midgut; in vertebrates below true mammals, it contains a yolk mass.
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http://www.encyclo.co.uk/local/21001
One of the set of extra-embryonic membranes, growing out from the gut over the yolk surface, in birds formed from the splanchnopleure, an outer layer of splanchnic mesoderm and an inner layer of endoderm.
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http://www.encyclo.co.uk/visitor-contributions.php
in embryos and early fish larvae, a bag-like ventral extension of the gut containing nutrive materials. It nourishes the growing fish until it is able to feed itself.
Found on
http://www.fish-uk.com/dictionary.htm
Type: Term Definitions: 1. in vertebrates with telolecithal eggs, the highly vascular layer of splanchnopleure surrounding the yolk of an embryo; 2. in humans and other mammals, the sac of extraembryonic membrane that is located ventral to the embryonic disk and, after formation of the gut tube, is connected to the midgut; by the second month of de...
Found on
http://www.medilexicon.com/medicaldictionary.php?t=79298
Yolk sac: Not all yolk has to do with birds' eggs. Human embryos have a yolk sac, too. The human yolk sac is a membrane outside the embryo that is connected by a tube (the yolk stalk) though the umbilical opening to the embryo's midgut. The yolk sac serves as an early site for the formation of blood and in time is incorporated into the primitive gu...
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http://www.medterms.com/script/main/art.asp?articlekey=6063
The highly vascular umbilical vesicle that envelopes the nutritive yolk of a developing embryo. The yolk sac is attached to the embyro's midgut.
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http://www.pregnology.com/
[
n] - membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional 2. [n] - membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes
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http://www.webdictionary.co.uk/definition.php?query=yolk%20sac
In avian biology, the extra-embryonic membrane inside the egg that surrounds the yolk of the developing embryo.
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https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter
umbilical vesicle noun membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional
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https://www.encyclo.co.uk/local/20974
Sac containing the yolk in the egg of most vertebrates. The term is also used for the membranous sac formed below the developing mammalian embryo and connected with the umbilical cord
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https://www.encyclo.co.uk/local/21221
large sac containing nutrients which is present in embryos of reptiles and amphibians.
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https://www.encyclo.co.uk/local/21694
the membrane that surrounds the yolk in the incubating egg
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https://www.encyclo.co.uk/local/22440
the membrane-covered food pouch found on the belly of a newly hatched fish. It nourishes the growing fish until it is able to feed itself.
Found on
https://www.encyclo.co.uk/local/22502
an extraembryonic membrane that encloses the yolk of eggs in birds, reptiles, and marsupials and that circulates nourishment from the yolk to the developing embryo. · a similar membrane in placental mammals that encloses a mostly hollow space and loses its nutritive function entirely as the placenta develops.
Found on
https://www.infoplease.com/dictionary/yolk-sac
No exact match found.
