| UCS | unconditioned stimulus; unconscious; uterine compression syndrome |
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| UD | ulcerative dermatosis; ulnar deviation; undetermined; underdeveloped; unit dose; urethral dilatation... |
| UPS | ultraviolet photoelectron spectroscopy; uninterruptible power supply; uroporphyrinogen synthetase; u... |
| URF | unidentified reading frame; uterine relaxing factor |
| uterine tubes | See Fallopian tubes. (12 Dec 1998) |
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| uterine tympanites | Distention of the uterine cavity with air or gas. Synonym: uterine tympanites. Origin: physo-+ G. Metra, uterus (05 Mar 2000) |
| uterine veins | Two veins on each side which arise from the uterine venous plexus, pass through a part of the broad ligament and then through a peritoneal fold, and empty into the internal iliac vein. Synonym: venae uterinae. (05 Mar 2000) |
| uterine venous plexus | The plexiform veins that lie along the sides of the uterus in the broad ligament. Synonym: plexus venosus uterinus. (05 Mar 2000) |
| fimbriae of uterine tube | The irregularly branched or fringed processes surrounding the ampulla at the abdominal opening of the uterine tube; most of the lining epithelial cells have cilia that beat toward the uterus. Synonym: fimbriae tubae uterinae, laciniae tubae, Richard's fringes. (05 Mar 2000) |
| lower uterine segment | The inferior portion or isthmus of the uterus, the lower extremity of which joins with the cervical canal and, during pregnancy, expands to become the lower part of the uterine cavity. (05 Mar 2000) |
| lower uterine segment cesarean section | A cesarean section in which the uterus is entered in its lower segment by a transperitoneal approach. (05 Mar 2000) |