Allantois - Wikipedia
网页The allantois (/ əˈlæntoʊɪs / a-LAN-toe-iss; [1] pl.: allantoides or allantoises) is a hollow sac-like structure filled with clear fluid that forms part of a developing amniote 's conceptus (which consists of all embryonic and extraembryonic tissues). It helps the embryo exchange gases and handle liquid waste.
Allantois - Definition, Function and Quiz | Biology Dictionary
网页2017年4月27日 · The allantois is characteristic of reptiles, birds, and mammals, and lies between two other extraembryonic membranes: the amnion, the innermost layer, which covers and protects the embryo; and the chorion, which is the outermost layer, housing the embryo and all the other extraembryonic membranes.
Allantois | Embryonic, Development, Sac | Britannica
网页allantois, an extra-embryonic membrane of reptiles, birds, and mammals arising as a pouch, or sac, from the hindgut. In reptiles and birds it expands greatly between two other membranes, the amnion and chorion, to serve as a temporary respiratory organ while its cavity stores fetal excretions.
Allantoic acid - Wikipedia
网页Allantoic acid is an organic compound with the chemical formula C 4 H 8 N 4 O 4. It is a crystalline acid obtained by hydrolysis of allantoin. In nature, allantoic acid is produced from allantoin by the enzyme allantoinase (encoded by the gene AllB (Uniprot: P77671) in Escherichia coli and other bacteria).
Allantoic acid | C4H8N4O4 | CID 203 - PubChem
网页Allantoic acid is a member of the class of ureas that consists of acetic acid in which the two methyl hydrogens are replaced by carbamoylamino groups respectively. It has a role as a plant metabolite and a mouse metabolite. It is a conjugate acid of an allantoate.
The Allantoic Core Domain: New Insights Into Development of …
网页The Allantoic Core Domain (ACD) is essential for allantoic elongation but not vascularization. A: Average length of allantoises: freshly dissected (squares); fixed and immunostained for T (this study) and Oct-3/4 (previous study) (circles).
Allantois - an overview | ScienceDirect Topics
网页In mammals, the allantois is a principal component of the chorioallantoic placenta (Figure 3 (b)). The allantoic vesicle connects to the urinary system and in some species, such as the sheep, is a receptacle for fetal urine. In others, such as rodents, the vesicle may be reduced or absent.
The mouse allantois: new insights at the …
网页2022年10月17日 · Overview. Placentalia, one of three mammalian subgroups, are characterized by extreme dependence on their mother during gestation. Nestled within her uterus, the fetus relies wholly on the vast functional repertoire of the chorio-allantoic placenta, with whom it shares its genetic dowry, for survival and development.
The Chick Chorioallantoic Membrane: A Model of Molecular, …
网页2010年3月21日 · The novelty of the amniotic egg is the presence of three extraembryonic membranes, amnios, chorion, and allantois, which surround the embryo, mediate between it and the environment, and provide an aqueous medium to complete development and ontogenetic program inside the eggshell.
Allantois - Biology Simple
网页2024年3月1日 · The allantois is a vital structure found in the embryonic stage of reptiles, birds, and mammals. This sac-like organ serves several crucial functions necessary for the development and survival of the embryo. Understanding the functions of the allantois sheds light on its importance in the overall embryonic development process. Nutrient Transport.
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