| oromandibular dystonia | Oro- refers to the mouth and mandibular refers to the lower jaw. Oromandibular dystonia affects the muscles of the jaw, lips, and tongue. The jaw may be pulled either open or shut, and speech and swallowing can be difficult. (12 Dec 1998) |
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| oronasal | Relating to the mouth and nose. (05 Mar 2000) |
| oronasal fistula | A pathologic communication between the nasal cavity and the oral cavity. (05 Mar 2000) |
| oronasal membrane | A thin, transient epithelial sheet separating the primitive nasal cavity from the stomodeum in the seven-week-old human embryo. Synonym: oronasal membrane. (05 Mar 2000) |
| oropharyngeal | Relating to the oropharynx. (05 Mar 2000) |
| oropharyngeal membrane | A bilaminar (ectoderm and endoderm) membrane derived from the prochordal plate; after the embryonic head fold has evolved it lies at the caudal limit of the stomodeum. Synonym: oral membrane, oropharyngeal membrane. (05 Mar 2000) |
| oropharyngeal passage | 1. <anatomy> The narrow passage from the mouth to the pharynx, situated between the soft palate and the base of the tongue; called also the isthmus of the fauces. On either side of the passage two membranous folds, called the pillars of the fauces, inclose the tonsils. 2. <botany> The throat of a calyx, corolla, etc. 3. <zoology> That portion of the interior of a spiral shell which can be seen by looking into the aperture. Origin: L. Source: Websters Dictionary (01 Mar 1998) |
| oropharynx | The area of the throat at the back of the mouth. (12 Dec 1998) |
| orophilic | <zoology> Describes an organism that lives or thrives in subalpine regions. (09 Oct 1997) |
| orosomucoid | <biology> Plasma protein of mammals and birds, 38% carbohydrate. In humans a single chain glycoprotein of 39 kD. Increased levels are associated with inflammation, pregnancy and various diseases. (18 Nov 1997) |
| orotate | A salt or ester of orotic acid. (05 Mar 2000) |
| orotate phosphoribosyltransferase | <enzyme> The enzyme catalyzing the formation of orotidine-5'-phosphoric acid (orotidylic acid) from orotic acid and 5-phosphoribosyl-1-pyrophosphate in the course of pyrimidine nucleotide biosynthesis. Chemical name: Orotidine-5'-phosphate:pyrophosphate phospho-alpha-D-ribosyltransferase Registry number: EC 2.4.2.10 (12 Dec 1998) |
| orotic acid | Intermediate in the de novo synthesis of pyrimidines. Linked glycosidically to ribose 5' phosphate, orotate forms the pyrimidine nucleotide orotidylate, that on decarboxylation at position 5 of the pyrimidine ring yields the major nucleotide uridylate (uridine 5' phosphate). (18 Nov 1997) |
| orotic aciduria | A rare disorder of pyrimidine metabolism characterised by hypochromic anaemia with megaloblastic changes in bone marrow, leukopenia, retarded growth, and urinary excretion of orotic acid; autosomal recessive inheritance. Origin: orotic acid + G. Ouron, urine (05 Mar 2000) |
| orotidine | Orotic acid-3-beta-d-ribonucleoside; uridine-6-carboxylic acid;elevated in cases of orotidinuria. Synonym: 1-ribosylorotate. Abbreviation: Ord (05 Mar 2000) |