How to use allantois in a sentence

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Sentence Examples The urachus is a remnant of allantoic origin, connecting the embryonal cloaca to the allantois during early intrauterine life. The allantois is a structure that collects the waste that the embryo produces before it hatches. In reptiles and birds, the amnion, chorion, and allantois are further protected by a hard or leathery calcareous shell. The blood-vessel network of the underlying allantois conveys nutrients that diffuse through the trophoblast to the body of the embryo proper. The allantois forms as an outpocketing of the embryo's hindgut and grows outward into the space between the amnion and chorion. Vertebrates have three embryonic membranes: the amnion, the chorion, and the allantois. In the fetus, the urachus connects the bladder with the allantois. The function of the amniotic membrane is largely protective, whereas the allantois serves as a collection area for waste materials and a site of gas exchange. The kidneys also excrete their products into the allantois. In early fetal development, the ventral cloaca is connected to the allantois via the urachus. For infection, fertilized chicken eggs at embryonation day 11 were inoculated with virus into the allantois sack or onto the chorioallantoic membrane. Examples from Classical Literature The cavity of the allantois, by means of its stalk passing through the umbilicus, is of course continuous with the cloaca. Similar movements are also seen in the allantois at a considerably later period. As the allantois increases in size and importance, the allantoic vessels are correspondingly developed. The allantoic cavity persists, but the allantois only covers the placental area of the chorion. The ureters open higher up than the other ducts into the stalk of the allantois which dilates to form the bladder. When the allantois adheres to the subzonal membrane vascular processes grow out from it into these villi. Figure 4M passes through the region where both the allantois and the Wolffian ducts open into the hindgut. The union of the allantois and the gut accounts for the elongated outline of the enteron in this section. It thus comes about that the further splitting of the mesoblast merely enlarges the cavity in which the allantois lies. The cavity of the allantois, if developed, vanishes completely. From the first the allantois lies in the pleuroperitoneal cavity. The function of the allantois is still in a great measure unknown. So the allantois of the reptile has become the placenta of the mammal. The allantois was quite free and not attached to the subzonal membrane. The allantois is a simple vascular sack with a large cavity. Find more words! 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Words that rhyme with allantois What is the plural of allantois? What is the adjective for allantois? What is the noun for allantois? Use our Sentence Generator Nearby Words allantoin allantoid allantoic allanite all and sundry Allan Allard Allardyce all-around all arrangements all aspects allative 9-letter Words Starting With a al all alla allan allant allanto allantoi