| finger-thumb reflex | Opposition and adduction of the thumb with flexion at its metacarpophalangeal joint and extension at its interphalangeal joint, when firm passive flexion of the third, fourth, or fifth finger is made; the reflex is present normally but is absent in pyramidal lesions. Synonym: finger-thumb reflex, Mayer's reflex. (05 Mar 2000) |
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| finger-to-finger test | A test for coordination and position sense of the upper limbs; the subject is asked to approximate the ends of his index fingers; assesses cerebellar function. (05 Mar 2000) |
| approximation | 1. The act of approximating; a drawing, advancing or being near; approach; also, the result of approximating. "The largest capacity and the most noble dispositions are but an approximation to the proper standard and true symmetry of human nature." (I. Taylor) 2. An approach to a correct estimate, calculation, or conception, or to a given quantity, quality, etc. 3. <mathematics> A continual approach or coming nearer to a result; as, to solve an equation by approximation. A value that is nearly but not exactly correct. Origin: Cf. F. Approximation, LL. Approximatio. Source: Websters Dictionary (01 Mar 1998) |
| approximation suture | A suture that pulls together the deep tissues. (05 Mar 2000) |
| Hartree-Fock approximation | <radiobiology> A refinement of the Hartree method in which one uses determinants of single-particle wave functions rather than products, thereby introducing exchange terms into the Hamiltonian. (06 Mar 1998) |
| adductor muscle of thumb | <anatomy, muscle> Origin, by two heads, the transverse head from the shaft of the third metacarpal and the oblique head from the front of the base of the second metacarpal, the trapezoid and capitate bones; insertion, medial side of base of proximal phalanx of thumb; action, adducts thumb; nerve supply, ulnar. Synonym: musculus adductor pollicis, adductor muscle of thumb. (05 Mar 2000) |
| bifid thumb | A congenital malformed thumb where the distal phalanx is divided. (05 Mar 2000) |
| gamekeeper's thumb | <radiology> Dislocation of 1st MCP joint, with or without avulsion fracture, rupture of ulnar collateral ligament, gamekeeper twists and pulls off head of cute little animals, now seen due to ski-pole injuries (12 Dec 1998) |
| carpometacarpal joint of thumb | The saddle-shaped synovial articulation between the trapezium and the base of the first metacarpal bone. Synonym: articulatio carpometacarpea pollicis. (05 Mar 2000) |
| chief artery of thumb | <anatomy, artery> Origin, radial (deep palmar (arterial) arch); distribution, palmar surface and sides of thumb; anastomoses, arteries on dorsum of thumb. Synonym: arteria princeps pollicis, chief artery of thumb, princeps pollicis, principal artery of thumb. (05 Mar 2000) |
| congenital clasped thumb with mental retardation | See: Clasped thumbs and mental retardation. (12 Dec 1998) |
| principal artery of thumb | <anatomy, artery> Origin, radial (deep palmar (arterial) arch); distribution, palmar surface and sides of thumb; anastomoses, arteries on dorsum of thumb. Synonym: arteria princeps pollicis, chief artery of thumb, princeps pollicis, principal artery of thumb. (05 Mar 2000) |
| short abductor muscle of thumb | <anatomy, muscle> Origin, tubercle of trapezium and flexor retinaculum; insertion, lateral side of proximal phalanx of thumb; action, abducts thumb; nerve supply, median. Synonym: musculus abductor pollicis brevis, short abductor muscle of thumb. (05 Mar 2000) |
| short extensor muscle of thumb | <anatomy, muscle> Origin, dorsal surface of radius; insertion, base of proximal phalanx of thumb; action, extends and abducts the thumb; nerve supply, radial. Synonym: musculus extensor pollicis brevis, musculus extensor brevis pollicis, short extensor muscle of thumb. (05 Mar 2000) |
| short flexor muscle of thumb | <anatomy, muscle> Origin, superficial portion from flexor retinaculum of wrist, deep portion from ulnar side of first metacarpal bone; insertion, base of proximal phalanx of thumb; action, flexes proximal phalanx of thumb; nerve supply, median (superficial head) and deep branch of ulnar (deep head). Some authors consider the deep head to be the first in a series of four palmar interossei muscles of the hand. Synonym: musculus flexor pollicis brevis, short flexor muscle of thumb. (05 Mar 2000) |