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allantois    
n. 尿膜

尿膜

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  • Allantois - Wikipedia
    The allantois ( ə ˈ l æ n t oʊ ɪ s a-LAN-toe-iss; [1] pl : allantoides or allantoises) is one the extraembryonic membranes 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
  • 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
  • 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
  • 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 - an overview | ScienceDirect Topics
    The allantois arises as an endodermally lined ventral outpocketing of the hindgut (see Fig 7 1) In the human embryo, it is just a vestige of the large, saclike structure that is used by the embryos of many mammals, birds, and reptiles as a major respiratory organ and repository for urinary wastes
  • Allantois | definition of allantois by . . . - Medical Dictionary
    allantois An extraembryonic membranous sac found in a developing animal conceptus, which is comprised of all embryonic and extraembryonic tissues It is intimately involved in gas and liquid waste exchange, as well as erythropoiesis; it gives rise to the foetal umbilical arteries and vein and contributes to the formation of the urinary bladder
  • Allantois - Function, Application, Parts, Structure and . . .
    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





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