| orifice of inferior vena cava | The orifice through which the inferior vena cava opens into the right atrium. Synonym: ostium venae cavae inferioris, orifice of inferior vena cava. (05 Mar 2000) |
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| orifice of internal acoustic meatus | The inner opening of the internal acoustic meatus on the posterior surface of the petrous part of the temporal bone. Synonym: porus acusticus internus, internal acoustic foramen, internal acoustic pore, auditory pore, internal auditory foramen, orifice of internal acoustic meatus. (05 Mar 2000) |
| orifice of superior vena cava | The point of entry of the superior vena cava into the right atrium. Synonym: ostium venae cavae superioris, orifice of superior vena cava. (05 Mar 2000) |
| tricuspid orifice | An atrioventricular opening which leads from the right atrium into the right ventricle of the heart. Synonym: ostium atrioventriculare dextrum, ostium venosum cordis. (05 Mar 2000) |
| external urethral orifice | The slitlike opening of the urethra in the glans penis, the external orifice of the urethra (in the female) in the vestibule, usually upon a slight elevation, the papilla urethrae. Synonym: ostium urethrae externum, external opening of urethra, meatus urinarius, orificium urethrae externum. (05 Mar 2000) |
| ureteric orifice | The opening of the ureter in the bladder, situated one at each lateral angle of the trigone; wide gaping of the ostium usually indicates vesicoureteral reflux. Synonym: ostium ureteris, orificium ureteris, ureteral meatus, ureteral opening. (05 Mar 2000) |
| anomalous uterus | A malformed uterus caused by abnormal development or fusion of the paramesonephric ducts. (05 Mar 2000) |
| arcuate uterus | A uterus with a depression at the fundus; an incomplete uterus bicornis. Synonym: uterus arcuatus. (05 Mar 2000) |
| artery of round ligament of uterus | Origin, inferior epigastric; distribution, round ligament of uterus. Synonym: arteria ligamenti teretis uteri. (05 Mar 2000) |
| bicornate uterus | A uterus that is more or less completely divided into two lateral horns as a result of imperfect fusion of the paramesonephric ducts; it differs from septate uterus, in which there is no external mark of separation; in uterus bicornis, the cervix may be single (uterus bicornate unicollis) or double (uterus bicornate bicollis). Synonym: bifid uterus, uterus bicornis, uterus bifidus. (05 Mar 2000) |
| bifid uterus | A uterus that is more or less completely divided into two lateral horns as a result of imperfect fusion of the paramesonephric ducts; it differs from septate uterus, in which there is no external mark of separation; in uterus bicornis, the cervix may be single (uterus bicornate unicollis) or double (uterus bicornate bicollis). Synonym: bifid uterus, uterus bicornis, uterus bifidus. (05 Mar 2000) |
| biforate uterus | Septate uterus in which the cervix is divided into two by a septum. Synonym: double-mouthed uterus, uterus biforis. (05 Mar 2000) |
| bipartite uterus | A uterus divided into two cavities by an anteroposterior septum. Synonym: bipartite uterus, uterus bilocularis, uterus bipartitus, uterus septus. (05 Mar 2000) |
| body of uterus | The part of the uterus above the isthmus, comprising about two thirds of the non-pregnant organ. Synonym: corpus uteri. (05 Mar 2000) |
| border of uterus | The right or left margin of the uterus along which the broad ligament is attached. The uterine tube and round ligament attach to the uterus at the upper part of the border. Synonym: margo uteri. (05 Mar 2000) |