DICT.TW Dictionary Taiwan

 umbilical vesicle 名詞
 臍囊,臍泡

 Um·bil·ic·al a.
 1. Anat. Of or pertaining to an umbilicus, or umbilical cord; umbilic.
 2. Pertaining to the center; central. [R.]
 Umbilical cord. (a) Anat. The cord which connects the fetus with the placenta, and contains the arteries and the vein through which blood circulates between the fetus and the placenta; the navel-string. (b) Bot. The little stem by which the seeds are attached to the placenta; -- called also funicular cord.
 Umbilical hernia Med., hernia of the bowels at the umbilicus.
 Umbilical point Geom., an umbilicus. See Umbilicus, 5.
 Umbilical region Anat., the middle region of the abdomen, bounded above by the epigastric region, below by the hypogastric region, and on the sides by the lumbar regions.
 Umbilical vesicle Anat., a saccular appendage of the developing embryo, containing the nutritive and unsegmented part of the ovum; the yolk sac. See Illust. in Appendix.
 ◄ ►

 umbilical vesicle
      n : membranous structure that functions as the circulatory
          system in mammal embryos until the heart becomes
          functional [syn: yolk sac, vitelline sac, vesicula
          umbilicus]