Umbilicus. Navel. Urea. The most important of the solid constituents of the urine. Ureters. The ducts leading from the kidneys to the bladder. Urethra. The excretory duct from the bladder for the escape of the urine. Urination. The act of passing water. Uterosacral Ligaments. Ligaments which pass from the uterus to the sacrum, and assist in holding the uterus in position. Uterus. Womb; the hollow, pear-shaped pelvic organ which is destined to retain the child from the moment of its conception until the time of its expulsion at birth. Utricular Glands. Glands of the uterus. Vagina. The canal which connects the female internal and external organs of generation. Vascular. Pertaining to the blood-vessels. Vasomotor Nervous System. Comprises the brain, spinal cord, and the nerves given off from the cord: this system presides over voluntary acts, that is, those acts which are under the control of the will. Vestibule. A smooth cavity that exists in the female between the perineum and the nymphae. Viscera. The contents of the large cavities of the body. Vulva. The external genitals, private parts, the female external organs of generation. Vulvitis. Inflammation of the vulva.