Figure 4M passes through the region where both the allantois and the.    From Wordnik.com.  [Development of the Digestive Canal of the American Alligator] Reference

Endochorium: the layer of the allantois that lines the chorium; the inner layer of the chorium.    From Wordnik.com.  [Explanation of Terms Used in Entomology] Reference

The very young puppy, with attached ends of the yelk-sac and allantois, and invested in the amnion.    From Wordnik.com.  [Essays] Reference

The union of the allantois and the gut accounts for the elongated outline of the enteron in this section.    From Wordnik.com.  [Development of the Digestive Canal of the American Alligator] Reference

Owing to its thin walls and small lumen the allantois was traced only a short distance into the umbilical stalk.    From Wordnik.com.  [Development of the Digestive Canal of the American Alligator] Reference

The allantois is probably somewhat larger here than in the other embryos used for this stage, in which it was torn away.    From Wordnik.com.  [Development of the Digestive Canal of the American Alligator] Reference

Just anterior to these openings the cloaca opens ventrally into a small, anteriorly-projecting pouch, the rudiment of the allantois.    From Wordnik.com.  [Development of the Digestive Canal of the American Alligator] Reference

Thus in many mammals the mesodermal part of the allantois often appears long before the endodermal part, though this is phylogenetically older.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference

The allantois is cut near its opening into the hindgut; its walls are thin, the epithelium consisting of but a single layer of more or less flattened cells.    From Wordnik.com.  [Development of the Digestive Canal of the American Alligator] Reference

It was known by the 1860's that various nutritive, respiratory, and excretory organs (yolk-sac, allantois) characteristic of embryos are lacking in all adults.    From Wordnik.com.  [RECAPITULATION] Reference

Inside, the amnion encloses the embryo in a protected, moist environment in which nourishment is supplied by the yolk sac, and metabolic waste is stored by the allantois.    From Wordnik.com.  [Reptile] Reference

Figure 5 and 6 illustrate formation of amnion (a.) and allantois (all.).    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

One of the most obvious examples of this is the allantois in the Amniota.    From Wordnik.com.  [Hormones and Heredity] Reference

The allantois altogether disappears in the adult fowl; in the adult mammal.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

A very early condition of Man, with yelk-sac, allantois, and amnion (original).    From Wordnik.com.  [Lectures and Essays] Reference

Both the chorioallantoic placenta and CAM are derived from chorion and allantois.    From Wordnik.com.  [PLoS ONE Alerts: New Articles] Reference

Blood is taken out to the allantois, however, by the arteries of the latter type.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

Diagram illustrating early formation of allantois and differentiation of body-stalk.    From Wordnik.com.  [Illustrations. Fig. 25] Reference

For a clear understanding of the allantois and amnion, this last is almost indispensable.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

In man and other primates the nature of the allantois is entirely different from that just described.    From Wordnik.com.  [I. Embryology. 11. Development of the Fetal Membranes and Placenta] Reference

Figures to illustrate the relative function and importance of allantois and yolk sac in bird and mammal.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

Note particularly how the allantois (al.) has spread over surface of shell and how the yolk sac is shrivelled.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

The embryos of Reptiles, Birds, and Mammals all develop two embryonic or foetal membranes, the amnion and the allantois.    From Wordnik.com.  [Hormones and Heredity] Reference

It seems possible that it is merely the mechanical result of the weight of the embryo and the development of the allantois.    From Wordnik.com.  [Hormones and Heredity] Reference

In reptiles, birds, and many mammals the allantois becomes expanded into a vesicle which projects into the extra-embryonic celom.    From Wordnik.com.  [I. Embryology. 11. Development of the Fetal Membranes and Placenta] Reference

We find solid mesoblastic somites, we find primitive streak, allantois and amnion, features we have just been explaining as the consequence of an excess of yolk in the egg.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

This bend becomes dilated into a pouch, which constitutes the entodermal cloaca; into its dorsal part the hind-gut opens, and from its ventral part the allantois passes forward.    From Wordnik.com.  [XI. Splanchnology. 2. The Digestive Apparatus] Reference

25– Diagram illustrating early formation of allantois and differentiation of body-stalk.    From Wordnik.com.  [I. Embryology. 11. Development of the Fetal Membranes and Placenta] Reference

A tolerably early period, the two become distinguishable by the different form of their adjuncts, the yelk-sac and the allantois.    From Wordnik.com.  [Essays] Reference

The very young puppy, with attached ends of the yelk-sac and allantois, and invested in the amnion.).    From Wordnik.com.  [Lectures and Essays] Reference

(c) An allantois in development.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference