allantoic sac
[/ælænˈtoʊɪk sæk/]
nounpl: allantoic sacs
saco alantóide
1. A membranous sac derived from the endoderm of the yolk sac in embryonic development, which serves as a repository for nitrogenous wastes and plays a crucial role in gas exchange and nutrient absorption in amniotes
The allantoic sac expands during avian embryonic development to facilitate gas exchange through the eggshell membrane.
O saco alantóide se expande durante o desenvolvimento embrionário aviário para facilitar a troca gasosa através da membrana da casca do ovo.
2. In mammals, the allantois contributes to the formation of the umbilical cord and fetal membranes, including the placenta
The allantoic sac in human development fuses with the chorion to form part of the placenta.
O saco alantóide no desenvolvimento humano se funde com o córion para formar parte da placenta.
This is a highly specialized anatomical and embryological term used primarily in medical, biological, and veterinary education and research. It appears in medical dictionaries, embryology textbooks, and scientific literature in both English and Portuguese-speaking countries. The term is identical in usage across Brazil and Portugal, reflecting the international nature of medical terminology.
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