'Umbilical vesicle' definitions:

Definition of 'umbilical vesicle'

(from WordNet)
noun
Membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional [syn: yolk sac, vitelline sac, umbilical vesicle, vesicula umbilicus]

Definition of 'Umbilical vesicle'

From: GCIDE
  • Umbilical \Um*bil"ic*al\, a. [Cf. F. ombilical. See Umbilic, n.]
  • 1. (Anat.) Of or pertaining to an umbilicus, or umbilical cord; umbilic. [1913 Webster]
  • 2. Pertaining to the center; central. [R.] --DeFoe. [1913 Webster]
  • 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. [1913 Webster] Umbilicate