| quadrangular cartilage | A thin cartilaginous plate located between vomer, perpendicular plate of the ethmoid, and nasal bones, and completing the nasal septum anteriorly. Synonym: cartilago septi nasi, cartilage of nasal septum, cartilaginous septum, pars cartilaginea septi nasi, quadrangular cartilage, septal cartilage. (05 Mar 2000) |
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| quadrangular lobule | The main portion of the superior part of each hemisphere of the cerebellum, corresponding to the monticulus of the vermis; it is divided into two portions, the anterior and the posterior crescentic lobules, corresponding to the culmen and the declive of the vermis. Synonym: lobulus quadrangularis, lobus quadratus, lobulus quadratus, quadrate lobe, quadrate lobule. (05 Mar 2000) |
| quadrangular membrane | The elastic fibra membrane that extends from the ventricular fold of the larynx upward to the aryepiglottic fold; it attaches anteriorly to the epiglottis and posteriorly to the lateral margin of the arytenoid and corniculate cartilages. Synonym: membrana quadrangularis, Tourtual's membrane. (05 Mar 2000) |
| quadrangular space | Musculotendinous formation providing passageway for the axillary nerve, posterior humeral circumflex artery and accompanying veins as they run from the axilla to the superior posterior arm; as the neurovascular structures enter the formation anteriorly, it is bounded superiorly by the shoulder joint, medially by the lateral border of subscapularis, laterally by the surgical neck of the humerus, and inferiorly by the tendon of latissimus dorsi; as the vessels exit the formation posteriorly, it is bounded superiorly by the teres minor, medially by the long head of the triceps, laterally by the lateral head of the triceps and inferiorly by the teres major muscle or tendon; as they emerge, most of the neurovascular structures run on the deep surface of the deltoid muscle, which they supply. Synonym: quadrilateral space. (05 Mar 2000) |
| quadrangular therapy | Marriage therapy involving the husband and wife and their respective therapists. (05 Mar 2000) |
| quadrant | <dentistry> The four parts of your mouth, that is the upper left, the upper right, the lower left, and the lower right. (08 Jan 1998) |
| quadrantal | 1. A cubical vessel containing a Roman cubic foot, each side being a Roman square foot; used as a measure. 2. A cube. Origin: L. <geometry> Of or pertaining to a quadrant; also, included in the fourth part of a circle; as, quadrantal space. Quadrantal triangle, a spherical triangle having one side equal to a quadrant or arc of 90 deg . Quadrantal versor, a versor that expresses rotation through one right angle. Origin: L. Quadrantalis containing the fourth fourth part of a measure. Source: Websters Dictionary (01 Mar 1998) |
| quadrantanopia | Loss of vision in a quarter section of the visual field of one or both eyes; if bilateral, it may be homonymous or heteronymous, binasal or bitemporal, or crossed, e.g., involving the upper quadrant in one eye and the lower quadrant in the other. Synonym: quadrantic hemianopia. (05 Mar 2000) |
| quadrantic hemianopia | Loss of vision in a quarter section of the visual field of one or both eyes; if bilateral, it may be homonymous or heteronymous, binasal or bitemporal, or crossed, e.g., involving the upper quadrant in one eye and the lower quadrant in the other. Synonym: quadrantic hemianopia. (05 Mar 2000) |
| quadrantic scotoma | A scotoma involving a quarter segment of the central visual field. (05 Mar 2000) |
| quadrants | <dentistry> The four parts of your mouth, that is the upper left, the upper right, the lower left, and the lower right. (05 Mar 2000) |
| quadrat | Sample units or plots that vary in size, shape, number and arrangements, depending on the nature of the vegetation, site conditions and purpose of study. (09 Oct 1997) |
| quadrate | 1. Having four equal sides, the opposite sides parallel, and four right angles; square. "Figures, some round, some triangle, some quadrate." (Foxe) 2. Produced by multiplying a number by itself; square. " Quadrate and cubical numbers." 3. Square; even; balanced; equal; exact. " A quadrate, solid, wise man." 4. Squared; suited; correspondent. " A generical description quadrate to both. <anatomy>" Quadrate bone, a bone between the base of the lower jaw and the skull in most vertebrates below the mammals. In reptiles and birds it articulates the lower jaw with the skull; in mammals it is represented by the malleus or incus. Origin: L. Quadratus squared, p. P. Of quadrare to make four-cornered, to make square, to square, to fit, suit, from quadrus square, quattuor four. See Quadrant, and cf. Quadrat, Quarry an arrow, Square. 1. <geometry> A plane surface with four equal sides and four right angles; a square; hence, figuratively, anything having the outline of a square. "At which command, the powers militant That stood for heaven, in mighty quadrate joined." (Milton) 2. <astronomy> An aspect of the heavenly bodies in which they are distant from each other 90 deg, or the quarter of a circle; quartile. See the Note under Aspect. 3. <anatomy> The quadrate bone. Origin: L. Quadratum. See Quadrate. Source: Websters Dictionary (01 Mar 1998) |
| quadrate ligament | <anatomy> Fibres that pass from the distal margin of the radial notch of the ulna to the neck of the radius. Synonym: ligamentum quadratum, Denuce's ligament. (05 Mar 2000) |
| quadrate lobe | A lobe on the inferior surface of the liver located between the fossa for the gallbladder and the fissure for the ligamentum teres. Synonym: quadrangular lobule. Synonym: precuneus. (05 Mar 2000) |