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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, along with the amnion, chorion, and yolk sac (other extraembryonic membranes), identify humans and other mammals, birds, and reptiles as amniotes
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
Allantois - Definition, Function and Quiz | Biology Dictionary
The allantois is one of the four main membranes that surround an embryo It is found near the posterior of the embryo, since that’s where its development begins
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
The Allantois: Development, Function, and Comparative Anatomy
The allantois is an essential embryonic structure in the development of amniotes, including reptiles, birds, and mammals It plays a role in waste management, gas exchange, and the formation of important anatomical structures
Allantois Definition, Function Structure - Lesson | Study. com
The allantois represents a fetal membrane located just below the chorion The allantois facilitates gas exchange and serves as a storage site for waste products from the developing fetus
Allantois: Structure, Function Importance in Biology - 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
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 - MeSH - NCBI
Allantois An extra-embryonic membranous sac derived from the YOLK SAC of REPTILES; BIRDS; and MAMMALS It lies between two other extra-embryonic membranes, the AMNION and the CHORION The allantois serves to store urinary wastes and mediate exchange of gas and nutrients for the developing embryo Year introduced: 1991 (1975)
Allantois | definition of allantois by Medical dictionary
allantois a membranous growth from the central side of the hind gut of the developing vertebrate embryo that extends outside the embryo proper and is covered by a layer of connective tissue containing many blood vessels

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