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allantois

n. 尿膜

尿膜

WordNet (r) 3.0 (2006) (WordNet)

allantois
n 1: the vascular fetal membrane that lies below the chorion and
develops from the hindgut in many embryonic higher
vertebrates (reptiles, birds and mammals)

The Collaborative International Dictionary of English v.0.48 (gcide)

Allantois \Al*lan"to*is\, Allantoid \Al*lan"toid\, ] n.. (Anat.)
A membranous appendage of the embryos of mammals, birds, and
reptiles, -- in mammals serving to connect the fetus with the
parent; the urinary vesicle.
[1913 Webster]

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Allantois - Wikipedia
The allantois ( əˈlæntoʊɪs a-LAN-toe-iss; [1] pl : allantoides or allantoises) is one of the four membranes of the extraembryonic tissue arising from the yolk sac It is a hollow sac-like structure filled with clear fluid that forms part of the developing conceptus in an amniote that helps the embryo exchange gases and handle liquid waste The other extraembryonic membranes are the
Allantois | Embryonic, Development, Sac | Britannica
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 In mammals other than marsupials the allantois is intimately associated with the chorion
Allantois - an overview | ScienceDirect Topics
The allantois is defined as a structure derived from splanchnopleure that arises as a diverticulum of the hindgut, gradually filling the extraembryonic coelom and playing a role in vascularizing the chorion and amnion in various species In humans, it is vestigial, yet the placenta is of the chorioallantoic type AI generated definition based on: Progress in Molecular Biology and Translational
Allantois - Definition, Function and Quiz | Biology Dictionary
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
What Is the Allantois? Embryonic Function and Human Remnants
The allantois is one of the four membranes that surround and support an embryo in reptiles, birds, and mammals, and its core job shifts depending on the species In a chicken egg, it collects waste and handles gas exchange In a human embryo, it helps build the umbilical cord and placenta before largely vanishing, leaving behind only a thin fibrous strand you carry into adulthood That
ALLANTOIS Definition Meaning - Merriam-Webster
The meaning of ALLANTOIS is a vascular fetal membrane of reptiles, birds, and mammals that is formed as a pouch from the hindgut and that in placental mammals is intimately associated with the chorion in formation of the placenta
Allantois - Academic Dictionaries and Encyclopedias
Allantois (plural "allantoides" or "allantoises") is a part of a developing animal conceptus (which consists of all embryo nic and extra-embryonic tissues) It helps the embryo exchange gases and handle liquid waste
Allantois - eMouseAtlas
Mouse Phenotype Embryonic lethal phenotypes
Allantois Definition Structure and Function - Vedantu
The allantois is a hollow sac-like structure that is filled with transparent fluid, which is part of the concept of developing an amniotic membrane The allantois is also known as allantoic It is present in all embryos and extra-embryonic tissues It helps the embryo exchange gas and helps in disposing of the liquid waste The allantois, along with the amniotic membrane and chorionic membrane

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