| anus, imperforate | Persistence of the anal membrane, so that the anus is closed. The defect is not always complete; sometimes a narrow opening permits the passage of the bowel contents. When completely imperforate, the anus is seen as a dimple (the proctodeal pit) in the skin of the perineum. The latter condition is often associated with atresia of the lower rectum. (12 Dec 1998) |
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| imperforate | <embryology> Having an abnormal closure or absence of a body opening or tubular organ (for example, a child born without an oesophagus would have an atretic birthdefect). (09 Oct 1997) |
| imperforate anus | <embryology, paediatrics> A congenital obstruction of the anal opening. Occurs in approximately 1 in 5,000 infants. This condition is corrected through surgery. (27 Sep 1997) |
| imperforate hymen | A hymen in which there is no opening, the membrane completely occluding the vagina. (05 Mar 2000) |
| punctum | A point. Punctum caecum. [L, blind point. <anatomy> Same as Blind spot, under Blind. Punctum proximum, near point. See Point. Punctum remotum, far point. See Point. <botany> Punctum vegetationis [L, point of vegetation], the terminal cell of a stem, or of a leaf bud, from which new growth originates. Origin: L, a point. Source: Websters Dictionary (01 Mar 1998) |
| punctum caecum | The blind spot in the visual field corresponding to the location of the optic disk. (05 Mar 2000) |
| punctum coxale | The highest point of the crest of the ilium. (05 Mar 2000) |
| punctum dolorosum | See: Valleix's points. (05 Mar 2000) |
| punctum lacrimale | The minute circular opening of the lacrimal canaliculus, on the margin of each eyelid near the medial commissure. Synonym: punctum lacrimale, lacrimal opening. (05 Mar 2000) |
| punctum luteum | An oval area of the sensory retina, 3 by 5 mm, temporal to the optic disk corresponding to the posterior pole of the eye; at its centre is the central fovea, which contains only retinal cones. Synonym: area centralis, macula lutea, macular area, punctum luteum, Soemmerring's spot, yellow spot. (05 Mar 2000) |
| punctum ossificationis | The site of earliest bone formation via accumulation of osteoblasts within connective tissue (membranous ossification) or of earliest destruction of cartilage prior to onset of ossification (endochondral ossification). Synonym: punctum ossificationis, ossific centre, point of ossification. (05 Mar 2000) |
| punctum ossificationis primarium | This is the first site where bone begins to form in the shaft of a long bone or in the body of an irregular bone. Synonym: punctum ossificationis primarium, primary point of ossification. (05 Mar 2000) |
| punctum ossificationis secundarium | This is the centre of bone formation appearing later than the punctum ossificationis primarium, usually in epiphysis. Synonym: punctum ossificationis secundarium, secondary point of ossification. (05 Mar 2000) |
| punctum proximum | That point in conjugate focus with the retina when the eye exerts maximal accommodation. Synonym: punctum proximum. (05 Mar 2000) |
| punctum remotum | That point in conjugate focus with the retina when the eye is not accommodating. Synonym: punctum remotum. (05 Mar 2000) |