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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 of 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
  • 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
  • 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 - Function, Application, Parts, Structure and Significance
    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
  • 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 | Radiology Reference Article | Radiopaedia. org
    The allantois refers to one of the fetal membranes that contributes to umbilical cord formation It takes part in waste material collection and gas exchange During embryonic development, the allantois transforms into the fetal urachus, which in turn becomes the median umbilical ligament after birth History and etymology
  • What is the Difference Between Amnion and Allantois
    The main difference between amnion and allantois is that amnion is the thin layer in direct contact with the developing embryo whereas allantois is an extra-embryonic layer present between amnion and chorion
  • What is the function of allantois? - reptileknowledge. com
    The allantois is a sac-like extraembryonic membrane that removes waste from the embryo The allantois exchanges oxygen and carbon dioxide with the air outside the eggshell and serves as a disposal site for uric acid





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