| petit mal seizure | An absence seizure. (05 Mar 2000) |
|---|---|
| Petit's aponeurosis | The posterior layer of the broad ligament of the uterus. Origin: P. Petit (05 Mar 2000) |
| Petit's canals | The spaces between the fibres of the ciliary zonule at the equator of the lens of the eye. Synonym: spatia zonularia, Petit's canals. (05 Mar 2000) |
| Petit's hernia | Lumbar hernia, occurring in Petit's triangle. (05 Mar 2000) |
| Petit's ligament | A fold of peritoneum, containing the rectouterine muscle, passing from the sacrum to the base of the broad ligament on either side, forming the lateral boundary of the rectouterine (Douglas') pouch. Synonym: plica rectouterina, Douglas' fold, Jarjavay's ligament, Petit's ligament, rectouterine fold, uterosacral ligament. (05 Mar 2000) |
| Petit's lumbar triangle | An area in the posterior abdominal wall bounded by the edges of the latissimus dorsi and external oblique muscles and the iliac crest; herniations occasionally occur here. Synonym: trigonum lumbale, Petit's lumbar triangle. (05 Mar 2000) |
| Petit's sinus | The space between the superior aspect of each cusp of the aortic valve and the dilated portion of the wall of the ascending aorta, immediately above each cusp. Synonym: sinus aortae, Petit's sinus, Valsalva's sinus. Arlt's sinus, an inconstant depression on the lower portion of the internal surface of the lacrimal sac. Barber's pilonidal sinus, pilonidal sinus occurring in barbers, usually in the web between the fingers, due to the burying of exogenous hairs by the alternate loosening and tightening of tissues of the hand by the manipulation of scissors. (05 Mar 2000) |
| Petit, Alexis | <person> French physicist, 1791-1820. See: Dulong-Petit law. (05 Mar 2000) |
| Petit, Antoine | <person> French surgeon and anatomist, 1718-1794. See: Petit's ligament. (05 Mar 2000) |
| Petit, Francois du | <person> French surgeon and anatomist, 1664-1741. See: Petit's canals, Petit's sinus. (05 Mar 2000) |
| Petit, Jean | <person> Paris surgeon, 1674-1750. See: Petit's hernia, Petit's herniotomy, Petit's lumbar triangle. (05 Mar 2000) |
| Petit, Paul | <person> French anatomist, *1889. See: Petit's aponeurosis. (05 Mar 2000) |
| petite mutant | <molecular biology, organism> A class of yeast mutants, most studied in Saccharomyces cerevisiae. Mutants grow slowly and rely on anaerobic respiration: mitochondria, although present, have reduced cristae and are functionally defective (termed promitochondria). There are three types of petite mutant: (i) Segregational mutants that show Mendelian behaviour and result from mutations in mitochondrial genes located in the nucleus. (ii) Neutral petites, which are recessive genotypes and result from the complete absence of mitochondrial DNA. (iii) Suppressive petites, in which most of the mitchondrial DNA is lost (60-99%), though what remains is often amplified. (06 Oct 1997) |
| petong | <chemistry> See Packfong. Source: Websters Dictionary (01 Mar 1998) |
| petralogy | See Petrology. Source: Websters Dictionary (01 Mar 1998) |