| pronator reflex | Pronation and adduction of the hand caused by tapping the styloid process of the ulna. Synonym: pronator reflex. (05 Mar 2000) |
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| pronator ridge | An oblique ridge on the anterior surface of the ulna, giving attachment to the pronator quadratus muscle. (05 Mar 2000) |
| pronator teres | <anatomy, muscle> Origin, superficial (humeral) head (ulnar) from the common flexor origin on the medial epicondyle of the humerus, deep (ulnar) head from the medial side of the coronoid process of the ulna; insertion, middle of the lateral surface of the radius; action, pronates forearm; nerve supply, median. Synonym: musculus pronator teres, musculus pronator radii teres, round pronator muscle. (05 Mar 2000) |
| accessory quadrate cartilage | The two to four cartilaginous plates of the wing of the nose posterior to the greater alar cartilage. Synonym: cartilagines alares minores, accessory quadrate cartilage. (05 Mar 2000) |
| 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) |
| 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) |
| 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) |
| abdominal external oblique muscle | <anatomy, muscle> Origin, fifth to twelfth ribs; insertion, anterior half of lateral lip of iliac crest, inguinal ligament, and anterior layer of the rectus sheath; action, diminishes capacity of abdomen, draws thorax downward; nerve supply, thoracoabdominal nerves. Synonym: musculus obliquus externus abdominis, abdominal external oblique muscle. (05 Mar 2000) |
| abdominal internal oblique muscle | <anatomy, muscle> Origin, iliac fascia deep to lateral part of inguinal ligament, anterior half of crest of ilium, and lumbar fascia; insertion, tenth to twelfth ribs and sheath of rectus; some of the fibres from inguinal ligament terminate in the conjoint tendon; action, diminishes capacity of abdomen, flexes lumbar vertebral column (bends thorax forward); nerve supply, lower thoracic. Synonym: musculus obliquus internus abdominis, abdominal internal oblique muscle. (05 Mar 2000) |
| abdominal muscle deficiency syndrome | <syndrome> Congenital absence (partial or complete) of abdominal muscles, in which the outline of the intestines is visible through the protruding abdominal wall; in males, genitourinary anomalies (urinary tract dilation and cryptorchidism) are also found; genetics unclear. (05 Mar 2000) |
| abductor digiti minimi muscle of foot | Origin, lateral and medial processes of calcanean tuberosity; insertion, lateral side of proximal phalanx of fifth toe; action, abducts and flexes little toe; nerve supply, lateral plantar nerve. Synonym: musculus abductor digiti minimi pedis, abductor muscle of little toe, musculus abductor digiti quinti. (05 Mar 2000) |
| abductor digiti minimi muscle of hand | Origin, pisiform bone and pisohamate ligament; insertion, medial side of base of proximal phalanx of the little finger; action, abducts and flexes little finger; nerve supply, ulnar. Synonym: musculus abductor digiti minimi manus, abductor muscle of little finger, musculus abductor digiti quinti. (05 Mar 2000) |
| abductor muscle | <anatomy> Any muscle used to pull a body part away from the midline of the body. For example, the abductor leg muscles serve to spread the legs. The opposite of abductor is adductor. (12 Dec 1998) |