Allantois - Wikipedia The allantois ( əˈlæntoʊɪs 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
Allantoid - definition of allantoid by The Free Dictionary Define allantoid allantoid synonyms, allantoid pronunciation, allantoid translation, English dictionary definition of allantoid also al·lan·toi·dal adj 1 Of or having an allantois 2 Shaped like a sausage n See allantois American Heritage® Dictionary of the English Language,
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
Allantoides | definition of allantoides by Medical dictionary A membranous sac that develops from the posterior part of the digestive tract in the embryos of mammals, birds, and reptiles It is important in the formation of the umbilical cord and placenta in mammals Also called allantoid
What does Allantoid mean? - Definitions. net Allantoid refers to something that is shaped like a sausage or an elongated oval, generally used in the context of biological or anatomical descriptions It's derived from the term "allantois," an extra-embryonic membrane in the eggs of reptiles and birds, and the placenta of mammals, which is typically shaped in this manner
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 The allantois is a structure common in mammals
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 It helps the embryo exchange gas and helps in disposing of the liquid waste