umbilical ligament การใช้

• The allantois regresses into the embryo to give rise to the urinary bladder and median umbilical ligament.
• This canal is initially open, but later closes as the urachus goes on to definitively form the median umbilical ligament.
• Part of each umbilical artery closes up ( degenerating into what are known as the medial umbilical ligaments ), while the remaining sections are retained as part of the circulatory system.
• Proposed mechanisms for the spread of cancer cells to the umbilicus include direct transperitoneal spread, via the lymphatics which run alongside the obliterated umbilical vein, hematogenous spread, or via remnant structures such as the falciform ligament, median umbilical ligament, or a remnant of the vitelline duct.
• At birth, when the placental circulation ceases, the pelvic portion only of the umbilical artery remains patent gives rise to the superior vesical artery ( or arteries ) of the adult; the remainder of the vessel is converted into a solid fibrous cord, the medial umbilical ligament ( otherwise known as the obliterated hypogastric artery ) which extends from the pelvis to the umbilicus.