Allantois
a vascular, extraembryonic membrane of birds, reptiles, and certain mammals that develops as a sac or diverticulum from the ventral wall of the hindgut.
historical examples
an embryonic appendage, the allantois, used in reptiles and birds for respiration, has here been turned to another purpose.
the whence and the whither of man john mason tyler
the function of the allantois is still in a great measure unknown.
a system of midwifery edward rigby
the arteries of the allantois are originally the terminations of the primitive aort.
the anatomy of the human peritoneum and abdominal cavity george. s. huntington
the cavity of the allantois, if developed, vanishes completely.
the works of francis maitland balfour, volume iii (of 4) francis maitland balfour
the allantois becomes a part of the fetal umbilical cord after the formation of the placenta.
the ethics of medical homicide and mutilation austin o’malley
similar movements are also seen in the allantois at a considerably later period.
the works of francis maitland balfour, volume iii (of 4) francis maitland balfour
the other part of the archenteron wall make the allantois, the hind gut and the bladder.
the ethics of medical homicide and mutilation austin o’malley
it thus comes about that the further splitting of the mesoblast merely enlarges the cavity in which the allantois lies.
the works of francis maitland balfour, volume iii (of 4) francis maitland balfour
the fasciculus attached to the embryo is the allantois which becomes the umbilical cord.
the s-xual question august forel
as the allantois increases in size and importance, the allantoic vessels are correspondingly developed.
the works of francis maitland balfour, volume iii (of 4) francis maitland balfour
noun
a membranous sac growing out of the ventral surface of the hind gut of embryonic reptiles, birds, and mammals. it combines with the chorion to form the mammalian placenta
allantois al·lan·to·is (ə-lān’tō-ĭs)
n. pl. al·lan·to·i·des (āl’ən-tō’ĭ-dēz’)
a membranous sac that develops from the posterior part of the alimentary c-n-l in the embryos of mammals, birds, and reptiles, and is important in the formation of the umbilical cord and placenta in mammals. also called allantoid.
al’lan·to’ic (āl’ən-tō’ĭk) adj.
allantois
(ə-lān’tō-ĭs)
plural allantoides (āl’ən-tō’ĭ-dēz’)
a membranous sac that grows out of the lower end of the alimentary c-n-l in embryos of reptiles, birds, and mammals. in mammals, the blood vessels of the allantois develop into the blood vessels of the umbilical cord.
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noting a case, as in finnish, whose distinctive function is to indicate place to or toward which. the allative case. n. grammatical case expressing “motion towards,” 1860, from latin allatus “brought to,” used as past participle of adferre, affere “to bring to,” from ad- “to” (see ad-) + latus “borne, carried” (see oblate (n.)).