The Medial Umbilical LigamentAfter birth, when circulation in the placenta stops, only the pelvic portion of the umbilical artery remains patent, becoming the internal iliac and the first part of the superior vesicle artery in adulthood. The remainder of this vessel is converted into a solid fibrous cord, called the "medial umbilical ligament," which extends from the pelvis to the umbilicus, or navel, the depression in the abdomen that marks the point where the umbilical cord was attached to the fetus.Bowman's CapsuleA kidney contains about one million nephrons, the functional units of the kidney, and each of these consist of a renal corpuscle and a renal tubule. A "renal corpuscle" is composed of tangled clusters of blood capillaries called a "glomerulus," and a thin-walled, saclike structure, called the "Bowman's capsule," which surrounds the glomerulus. The Bowman's capsule is an expansion at the closed end of a renal tubule. It is composed of two layers of cells: an inner layer that closely
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