Learn what yolk sac is in pregnancy. Discover the function of the gestational yolk sac, the yolk sac definition, and learn what the yolk sac becomes.
yolk sac- membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional umbilical vesicle,vesicula umbilicus,vitelline sac sac- a structure resembling a bag in an animal 2.yolk sac- membranous structure enclosing the yolk of eggs in birds, repti...
yolk sac, or vitelline sac, attached by a delicate strand of tissue to the region where theumbilical cord(the structure connecting the fetus with the placenta) leaves theamnion. Two large arteries in the umbilical cord radiate from the
mother. Thus, although the yolk sac in higher mammals may be considered an evolutionary vestige from its yolky-egged ancestors, it still serves important functions in the young embryo. As the embryo ages, the yolk sac shrinks in size, and the allantois takes over the role of nutrition.See...
12.Objective To evaluate the value of yolk sac size and morphology in early pregnancy and prognosis. 目的探讨卵黄囊对早孕的诊断及其预后的价值. 13.Purpose To study the clinicopathological features of yolk sac tumor ( YST ) of the heart. ...
An unusual case of endodermal sinus (yolk sac) tumor arising in the vulva and presenting during pregnancy is reported. The tumor recurred within 4 months of surgery. Despite subsequent wide excision and chemotherapy, the patient succumbed to her illness due to widespread pulmonary and pleural ...
Theyolk sac, which is actually the secondary yolk sac, is the first visible structure to form within thegestational sac. Its presence definitively confirms the presence of an intrauterine pregnancy. It should always be seen byTVUSwhen the MSD exceeds 10 mm, corresponding to a gestational age of...
sonographic findings related to the yolk sac can be used to anticipate the course of pregnancy. This study only assessed the association between increased yolk sac diameter and its associated outcomes. More studies need to be carried out to assess other aspects of the yolk sac and its correlated...
Objective To evaluate the value ofyolk sacsize and morphology in early pregnancy and prognosis. 目的探讨卵黄囊对早孕的诊断及其预后的价值. 互联网 Purpose To study the clinicopathological features ofyolk sactumor ( YST ) of the heart. 目的:探讨心脏 卵黄 囊瘤临床病理特征. ...
yolk sac 美 英 na.【生】卵黄囊 网络卵黄的囊 英汉 英英 网络释义 na. 1. 【生】卵黄囊