| ostium urethrae internum | The internal opening or orifice of the urethra, at the anterior and inferior angle of the trigone. Synonym: ostium urethrae internum, internal urethral opening. (05 Mar 2000) |
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| ostium uteri internum | An elongated constriction at the junction of the body and cervix of the uterus. Synonym: isthmus uteri, Guyon's isthmus, orificium internum uteri, os uteri internum, ostium uteri internum. (05 Mar 2000) |
| os uteri internum | An elongated constriction at the junction of the body and cervix of the uterus. Synonym: isthmus uteri, Guyon's isthmus, orificium internum uteri, os uteri internum, ostium uteri internum. (05 Mar 2000) |
| erysipelas internum | An erysipelatous eruption in the vagina, uterus, and peritoneum, occurring in the puerperium. (05 Mar 2000) |
| labium internum cristae iliacae | The roughened inner margin of the crest that gives attachment to parts of the transversus abdominis, quadratus lumborum, and erector spinae muscles. Synonym: labium internum cristae iliacae. (05 Mar 2000) |
| ligamentum tarsale internum | <anatomy> The fibrous band that attaches the medial ends of the tarsal plates to the maxilla at the medial orbital margin. Synonym: ligamentum palpebrale mediale, ligamentum tarsale internum, tendo oculi, tendo palpebrarum. (05 Mar 2000) |