| umber mutation | A mutation yielding the termination codon UGA, resulting in premature termination of a polypeptide chain. Compare: suppressor mutation. Synonym: opal mutation. (05 Mar 2000) |
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| umbilic | 1. The navel; the center. "The umbilic of the world." 2. <geometry> An umbilicus. See Umbilicus, 5 . Origin: From L. Umbilicus: cf. F. Ombilic. See Navel. <anatomy> See Umbilical. Source: Websters Dictionary (01 Mar 1998) |
| umbilical | <anatomy> As pertains to the umbilicus (belly button). (27 Sep 1997) |
| umbilical arteries | Either of a pair of arteries originating from the internal iliac artery and passing through the umbilical cord to carry blood from the foetus to the placenta. (12 Dec 1998) |
| umbilical artery | <anatomy, artery> Before birth the arteria is a continuation of the internal iliac; after birth it is obliterated between the bladder and umbilicus, forming the medial umbilical ligament, the remaining portion, between the internal iliac artery and bladder, being reduced in size and giving off the superior vesical arteries. Synonym: arteria umbilicalis. (05 Mar 2000) |
| umbilical cord | The flexible structure, giving passage to the umbilical arteries and vein, which connects the embryo or foetus to the placenta. (12 Dec 1998) |
| umbilical cyst | A small red sessile or pedunculated tumour at the umbilicus in an infant; it is due to the persistence of a segment of the vitellointestinal duct. Synonym: umbilical cyst. (05 Mar 2000) |
| umbilical duct | A narrow tube present in the early embryo that connects the midgut of the embryo (through the umbilical opening) to the yolk sac outside the embryo. Later in development, the yolk stalk is usually obliterated but a remnants of it may persist, most commonly as a finger-like protrusion from the small intestine known as meckel's diverticulum. Found in 2-4% of people, meckel's diverticulum may become inflamed much like the appendix and require surgical removal. The yolk stalk is also called the umbilical duct, vitelline duct, or oomphalomesenteric duct. (12 Dec 1998) |
| umbilical fissure | A cleft on the inferior surface of the liver, running from the inferior border to the left extremity of the porta hepatis; it lodges the round ligament of the liver. Synonym: fissura ligamenti teretis, fissure for ligamentum teres, fossa venae umbilicalis, umbilical fissure, umbilical fossa. (05 Mar 2000) |
| umbilical fistula | A fistula of intestine or urachus at the umbilicus. (05 Mar 2000) |
| umbilical fossa | A cleft on the inferior surface of the liver, running from the inferior border to the left extremity of the porta hepatis; it lodges the round ligament of the liver. Synonym: fissura ligamenti teretis, fissure for ligamentum teres, fossa venae umbilicalis, umbilical fissure, umbilical fossa. (05 Mar 2000) |
| umbilical fungus | A mass of granulation tissue on the stump of the umbilical cord in the newborn. Yeast fungus, obsolete term for Saccharomyces. (05 Mar 2000) |
| umbilical hernia | <surgery> An abnormal protrusion of internal abdominal contents into a defect in the umbilical area. Common in the newborn, but usually resolves by age two. (27 Sep 1997) |
| umbilical notch | The notch in the inferior border of the liver that accommodates the round ligament. Synonym: incisura ligamenti teretis hepatis, incisura umbilicalis, umbilical notch. (05 Mar 2000) |
| umbilical part of left branch of portal vein | <anatomy, vein> The highly branched part of the left branch of the portal vein; the round and venous ligaments attach to this part. Synonym: pars umbilicalis rami sinistri venae portae hepatis. (05 Mar 2000) |