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allantois

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allantois
allantois Phys. (əˈlæntəʊɪs) [mod.L. in form, a factitious sing. f. the earlier form allantoīdes, ad. Gr. ἀλλαντο-ειδής: see allantoid.] The fœtal membrane (so named by ancient anatomists from its form in a calf) found only in mammals, birds, and reptiles, which lies between the amnion and chorion, ... Oxford English Dictionary
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Allantois
While the function of the allantois remains conserved, there is a divergence in the characteristics of the allantois among mammalian species. A patent allantois can result in a urachal cyst. wikipedia.org
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allantoic
allantoic, a. Phys. (ælænˈtəʊɪk) [f. allantois + -ic: cf. mod.Fr. allantoïque.] Of or belonging to the allantois.1836 Todd Cycl. Anat. & Phys. I. 47/1 Certain acids almost peculiar to individual animals such as the..allantoic. 1850 Daubeny Atom. Theory xi. (ed. 2) 365 The allantoic fluid of the cow.... Oxford English Dictionary
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Urachal diverticulum
A urachal diverticulum (also vesicourachal diverticulum) is a congenital disorder caused by the partial persistence of the allantois. The allantois, which later becomes the urachus, connects an embryo's bladder to the yolk sac. wikipedia.org
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allantoid
allantoid, a. and n. Phys. (əˈlæntɔɪd) [mod. ad. Gr. ἀλλαντο-ειδής; f. ἀλλᾶντ- sausage + -ειδής shaped: see -oid, and cf. mod.Fr. allantoïde.] A. adj. Of or pertaining to the allantois.1633 P. Fletcher Purple Isl. ii. xxiii, The last, from Urine-lake with waters base, In the allantoid sea empties hi... Oxford English Dictionary
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Amnion
The amnion, along with the chorion, the yolk sac and the allantois protect the embryo. The amnios consists of two layers:one is the granular layer, continued upon the inner or foetal surface of the allantois, and thence upon the umbilical wikipedia.org
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Umbilical-urachal sinus
Umbilical-urachal sinus is a congenital disorder of the urinary bladder caused by failure of obliteration of proximal or distal part of the allantois, wikipedia.org
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Urachal fistula
A urachal fistula is a congenital disorder caused by the persistence of the allantois (later, urachus), the structure that connects an embryo's bladder wikipedia.org
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Do chicks in eggs excrete? I want to know if, as a baby chick grows inside the egg, does it excrete waste? If it does excrete waste, does the waste just sit inside the egg with the chick, until the chick cracks open ...
Yes they excrete uric acid which is stored in the allantois of the embryo; which acts as a reservoir of nitrogenous waste.
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Urachal cyst
A urachal cyst is a sinus remaining from the allantois during embryogenesis. wikipedia.org
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Waste generation by embryo How does an embryo produce waste products even when its organ systems are not developed fully ? How does the placenta identify or differentiate waste materials from embryo ? Which organelle ...
The allantois is the structure that removes waste from the embryo.
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Chorioallantoic membrane
It is formed by the fusion of the mesodermal layers of two extra-embryonic membranes – the chorion and the allantois. Development of the allantois occurs extra embryonically from the ventral wall of the endodermal hindgut. wikipedia.org
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Amniotic sac
On the outer side, the amniotic sac is connected to the yolk sac, the allantois, and via the umbilical cord, the placenta. The yolk sac, amnion, chorion, and allantois are the four extraembryonic membranes that lie outside of the embryo and are involved in providing nutrients wikipedia.org
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Median umbilical ligament
Development The median umbilical ligament begins as the allantois in the embryonic period. It then becomes the urachus in the fetus. It contains the urachus, which is the obliterated form of the allantois. wikipedia.org
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Extraembryonic membrane
extraembryonic membranes in birds, reptiles, and mammals: the yolk sac which surrounds the yolk, the amnion which surrounds and cushions the embryo, the allantois with oxygen as well as the resorption of calcium from the shell, and the chorion which surrounds all of these and in avians successively merges with the allantois wikipedia.org
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