Allantois - Definition, Function and Quiz | Biology Dictionary
2017年4月27日 · The allantois is characteristic of reptiles, birds, and mammals, and lies between two other extraembryonic membranes: the amnion, the innermost layer, which covers and …
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, …
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 …
Allantois – A Comprehensive Guide - Anatomy Notes
2024年6月16日 · Structure and Composition of the Allantois. The allantois, a vital structure in embryonic development, is composed of an inner endodermal layer and an outer mesodermal …
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 …
Allantois - Biology Simple
2024年3月1日 · The allantois, a membranous sac found in the embryos of vertebrates, plays a crucial role in the development and survival of different species. Its significance varies among …
Allantois | definition of allantois by Medical dictionary
a small sausage-shaped outpouching from the caudal wall of the yolk sac of the early embryo, associated with early blood formation and development of the urinary bladder; its blood …
Allantois Definition and Examples - Biology Online Dictionary
2021年3月1日 · Allantois is one of the extraembryonic membranes essential during embryonic and fetal development of birds, reptiles, and certain mammals . It is sac-like or diverticulum …
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 …
Allantois - Cellular Development, Function & Anatomy - LifeMap …
The allantois is responsible for the induction of placental development and is the site of extraembryonic vasculogenesis, which occurs independently in the mesodermal wall of the …
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