cord. While the function of the allantois remains conserved, there is a divergence in the characteristics of the allantois among mammalian species. Structural...

connected to the yolk sac, the allantois, and via the umbilical cord, the placenta. The yolk sac, amnion, chorion, and allantois are the four extraembryonic...

and fetus in humans and other mammals. They are the amnion, chorion, allantois, and yolk sac. The amnion and the chorion are the chorioamniotic membranes...

increased need for oxygen. To compensate for this, the chorion and the allantois fuse together to form the chorioallantoic membrane. Together these form...

illustrating early formation of allantois and differentiation of body-stalk. 1 Amniotic cavity 2 Body-stalk 3 Allantois 4 Yolk-sac 5 Chorion Diagram showing...

A urachal cyst is a sinus remaining from the allantois during embryogenesis. It is a cyst which occurs in the remnants between the umbilicus and bladder...

the crystals previously isolated] are allantois acid, or the same substance that one found in the allantois fluid of cows; we will call it "allantoin"...

the allantois, and thence upon the umbilical cord; the other is the smooth outer layer, continued upon the outer or chorional surface of the allantois, and...

or edema, in at least two fetal compartments. By comparison, hydrops allantois or hydrops amnion is an accumulation of excessive fluid in the allantoic...

membranes (amnion for embryonic protection, chorion for gas exchange, and allantois for metabolic waste disposal or storage), thicker and keratinized skin...

a congenital disorder caused by the partial persistence of the allantois. The allantois, which later becomes the urachus, connects an embryo's bladder...

is at first prolonged backward into the body-stalk as the tube of the allantois; but, with the growth and flexure of the tail-end of the embryo, the body-stalk...

The urachus is a fibrous remnant of the allantois, a canal that drains the urinary bladder of the fetus that joins and runs within the umbilical cord...

It contains the urachus, which is the obliterated form of the allantois. The allantois forms a communication between the cloaca (terminal part of hindgut)...

surrounds the yolk, the amnion which surrounds and cushions the embryo, the allantois which among avians stores embryonic waste and assists with the exchange...

Diagram of a chicken egg in its ninth day. Membranes: allantois, chorion, amnion, and vitellus/yolk....

islands arise external to the developing embryo on the umbilical vesicle, allantois, connecting stalk and chorion. They are also known as Pander's islands...

similar to that of the allantois in mammals. Its growth starts from day 3 of embryonic development. Development of the allantois occurs extra embryonically...

connecting stalk) creates a tube with a covering of amniotic membrane with allantois and umbilical vessels as its content and mesoderm of the connecting stalk...

pregnancy. The up to fist-sized hippomanes are either attached to the allantois membrane or swim freely in the allantoic fluid. Occasionally such formations...

small allantois is found in modern amphibians. Later came the amnion surrounding the fetus proper, and the chorion, encompassing the amnion, allantois, and...

urachal fistula is a congenital disorder caused by the persistence of the allantois (later, urachus), the structure that connects an embryo's bladder to the...

covered with leathery or calcareous shells. An amnion (5), chorion (6), and allantois (8) are present during embryonic life. The eggshell (1) protects the crocodile...

bladder caused by failure of obliteration of proximal or distal part of the allantois, and the presentation of this anomaly is more common in children and rarer...

derives from the urogenital sinus, and it is initially continuous with the allantois. The upper and lower parts of the bladder develop separately and join...

cell mass will give rise to the pre-embryo, the amnion, yolk sac and allantois, while the fetal part of the placenta will form from the outer trophoblast...

Diagram of a monotreme egg. (1) Shell; (2) Yolk; (3) Yolk Sac; (4) Allantois; (5) Embryo; (6) Amniotic Fluid; (7) Amniotic Membrane; and (8) Membrane...

The vesico-urethral portion is the deepest portion, continuous with the allantois. It absorbs the ends of the mesonephric ducts and the associated ends...

derived from the urogenital sinus, and it is initially continuous with the allantois. In human males, the base of the bladder lies between the rectum and the...

provides the embryo with protection against shock from movement The allantois helps the embryo obtain oxygen and handles metabolic waste The chorion...