| quadrate 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) |
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| quadrate muscle | <anatomy> A muscle that is more or less square in shape. Synonym: musculus quadratus, quadrate muscle. (05 Mar 2000) |
| quadrate muscle of loins | <anatomy, muscle> Origin, iliac crest, iliolumbar ligament, and transverse processes of lower lumbar vertebrae; insertion, twelfth rib and transverse processes of upper lumbar vertebrae; action, abducts trunk; nerve supply, ventral primary rami of upper lumbar spinal nerves. Synonym: musculus quadratus lumborum, lumbar quadrate muscle, quadrate muscle of loins. (05 Mar 2000) |
| quadrate muscle of sole | <anatomy, muscle> Origin, by two heads from the lateral and medial borders of the inferior surface of the calcaneus; insertion, tendons of flexor digitorum longus; action, assists long flexor; nerve supply, lateral plantar. Synonym: musculus flexor accessorius, musculus quadratus plantae, accessory flexor muscle of foot, caro quadrata sylvii, musculus pronator pedis, plantar quadrate muscle, quadrate muscle of sole. (05 Mar 2000) |
| quadrate muscle of thigh | <anatomy> Insertion, intertrochanteric ridge; origin, lateral border of tuberosity of ischium; action, rotates thigh laterally; nerve supply, nerve to quadratus femoris (sacral plexus). Synonym: musculus quadratus femoris, quadrate muscle of thigh. (05 Mar 2000) |
| quadrate muscle of upper lip | Composed of three heads usually described as three separate muscles; they are the caput angulare or levator labii superioris alaeque nasi muscle; caput infraorbitale or levator labii superioris muscle; caput zygomaticum or zygomaticus minor muscle. Synonym: quadrate muscle of upper lip. (05 Mar 2000) |
| quadrate part of liver | The part of the medial segment of the liver which includes the quadrate lobe. Synonym: pars quadrata hepatis. (05 Mar 2000) |
| quadrate pronator muscle | <anatomy, muscle> Origin, distal fourth of anterior surface of ulna; insertion, distal fourth of anterior surface of radius; action, pronates forearm; nerve supply, anterior interosseous. Synonym: musculus pronator quadratus, quadrate pronator muscle. (05 Mar 2000) |
| quadratic | 1. Of or pertaining to a square, or to squares; resembling a quadrate, or square; square. 2. <chemistry> Tetragonal. 3. <mathematics> Pertaining to terms of the second degree; as, a quadratic equation, in which the highest power of the unknown quantity is a square. Origin: Cf. F. Quadratique. Source: Websters Dictionary (01 Mar 1998) |
| quadratics | <study> That branch of algebra which treats of quadratic equations. Source: Websters Dictionary (01 Mar 1998) |
| quadratojugal | <anatomy> Of or pertaining to the quadrate and jugal bones. Of or pertaining to the quadratojugal bone. The quadratojugal bone, a bone at the base of the lower jaw in many animals. Source: Websters Dictionary (01 Mar 1998) |
| quadratrix | <geometry> A curve made use of in the quadrature of other curves; as the quadratrix, of Dinostratus, or of Tschirnhausen. Source: Websters Dictionary (01 Mar 1998) |
| quadrature | 1. <mathematics> The act of squaring; the finding of a square having the same area as some given curvilinear figure; as, the quadrature of a circle; the operation of finding an expression for the area of a figure bounded wholly or in part by a curved line, as by a curve, two ordinates, and the axis of abscissas. 2. A quadrate; a square. 3. <mathematics> The integral used in obtaining the area bounded by a curve; hence, the definite integral of the product of any function of one variable into the differential of that variable. 4. <astronomy> The position of one heavenly body in respect to another when distant from it 90 deg, or a quarter of a circle, as the moon when at an equal distance from the points of conjunction and opposition. Quadrature of the moon, a point in an orbit which is at either extremity of the latus rectum drawn through the empty focus of the orbit. See: Quadrate. Origin: L. Quadratura: cf. F. Quadrature. Source: Websters Dictionary (01 Mar 1998) |
| quadratus femoris muscle | <anatomy> Insertion, intertrochanteric ridge; origin, lateral border of tuberosity of ischium; action, rotates thigh laterally; nerve supply, nerve to quadratus femoris (sacral plexus). Synonym: musculus quadratus femoris, quadrate muscle of thigh. (05 Mar 2000) |
| quadratus lumborum | <anatomy, muscle> Origin, iliac crest, iliolumbar ligament, and transverse processes of lower lumbar vertebrae; insertion, twelfth rib and transverse processes of upper lumbar vertebrae; action, abducts trunk; nerve supply, ventral primary rami of upper lumbar spinal nerves. Synonym: musculus quadratus lumborum, lumbar quadrate muscle, quadrate muscle of loins. (05 Mar 2000) |