The allantois, along with the amnion, chorion, and yolk sac (other extraembryonic membranes), identify humans and other mammals, birds, and reptiles as amniotes.

Apr 27, 2017 · 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, 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 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.

Jun 16, 2024 · The allantois serves as a conduit for oxygen and carbon dioxide exchange, essential for maintaining proper respiratory functions during early development. Additionally, it …

Jan 14, 2025 · 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, …

The allantois is derived from splanchnopleure (endoderm and splanchnic mesoderm). It arises as a diverticulum of the hindgut and gradually fills the entire extraembryonic coelom (exocoelom) …

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 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 …

Sep 17, 2024 · The allan­tois provides oxygen to mammals, birds, and reptiles, as well as food in mammals (via the placenta). The membrane of the allantois works with the chorion in …