| recessive inheritance | dominance of traits |
|---|---|
| recessive oncogene | <molecular biology> A single copy of this gene issufficient to suppress cell proliferation, the loss of both copies of the gene contributes to cancer formation. (09 Oct 1997) |
| recessive trait | See: dominance of traits. (05 Mar 2000) |
| recessive, autosomal | A gene on a nonsex chromosome (an autosome) that expresses itself only when there is no different gene present at that locus (spot on the chromosome). For example, cystic fibrosis (cf) is an autosomal recessive disorder. A cf child has the cf gene on both chromosome 7's (and so is said to be homozygous for cf). (12 Dec 1998) |
| recessive, x-linked | A gene on the X chromosome that expresses itself only when there is no different gene present at that locus (spot on the chromosome). For example, duchenne muscular dystrophy (dmd) is an x-linked recessive disorder. A dmd boy has the dmd gene on his sole x chromosome (and so is said to be hemizgous for dmd). Although it is much rarer, a girl can have dmd (by several different means as, for example, if she has the dmd gene on both her x chromosomes and so is homozygous for dmd). (12 Dec 1998) |
| recessus | Synonym: recess. Origin: L. A withdrawing, a receding (05 Mar 2000) |
| recessus anterior | A circumscript deepening of the interpeduncular fossa in the direction of the mamillary bodies. Synonym: recessus anterior. (05 Mar 2000) |
| recessus cochlearis | A small depression on the inner wall of the vestibule of the labyrinth at the portion of the pyramid of vestibule, between the two limbs into which the vestibular crest divides posteriorly; it is perforated by foramina giving passage to fibres which the cochlear branch of the vestibulocochlear nerve sends to the posterior extremity of the cochlear duct. Synonym: recessus cochlearis, Reichert's cochlear recess. (05 Mar 2000) |
| recessus costodiaphragmaticus | The cleftlike extension of the pleural cavity between the diaphragm and the rib cage; pleural effusions collect here when in the upright position, and since the lung only partially enters, this is the site of thoracocentesis. Synonym: recessus costodiaphragmaticus, phrenicocostal sinus. (05 Mar 2000) |
| recessus costomediastinalis | The recess of the pleural cavity between the costal cartilages and the mediastinum. Synonym: recessus costomediastinalis, costomediastinal sinus. (05 Mar 2000) |
| recessus duodenalis inferior | The variable peritoneal recess which lies behind the inferior duodenal fold and along the ascending part of the duodenum. Synonym: recessus duodenalis inferior, Gruber-Landzert fossa, inferior duodenal fossa. (05 Mar 2000) |
| recessus duodenalis superior | A peritoneal recess extending upward behind the superior duodenal fold. Synonym: recessus duodenalis superior, duodenojejunal fossa, duodenojejunal recess, Jonnesco's fossa, superior duodenal fossa. (05 Mar 2000) |
| recessus ellipticus | An oval depression in the roof and inner wall of the vestibule of the labyrinth, lodging the utriculus. Synonym: recessus ellipticus, fovea elliptica, fovea hemielliptica. (05 Mar 2000) |
| recessus epitympanicus | The upper portion of the tympanic cavity above the tympanic membrane; it contains the head of the malleus and the body of the incus. Synonym: recessus epitympanicus, attic, epitympanic space, epitympanum, Hyrtl's epitympanic recess, tympanic attic. (05 Mar 2000) |
| recessus hepatorenalis | The deep recess of the peritoneal cavity on the right side extending upward between the liver in front and the kidney and suprarenal behind; this is a gravity-dependent portion of the peritoneal cavity when in the supine position; fluids draining from the omental bursa drain here. Synonym: recessus hepatorenalis, hepatorenal pouch, Morison's pouch. (05 Mar 2000) |