| 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) |
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| 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) |
| Steinberg thumb sign | <clinical sign> In Marfan's syndrome, when the thumb is held across the palm of the same hand, it projects well beyond the ulnar surface of the hand. (05 Mar 2000) |
| opposer muscle of thumb | <anatomy, muscle> Origin, ridge of trapezium and flexor retinaculum; insertion, anterior surface of the full length of the shaft of the first metacarpal bone; action, acts at carpometacarpal joint to "cup" palm, enabling one to oppose thumb to other fingers; nerve supply, median. Synonym: musculus opponens pollicis, opposer muscle of thumb. (05 Mar 2000) |
| tear-thumb | <botany> A name given to several species of plants of the genus Polygonum, having angular stems beset with minute reflexed prickles. Source: Websters Dictionary (01 Mar 1998) |
| tennis thumb | Tendinitis with calcification in the tendon of the long flexor of the thumb (flexor pollicis longus) caused by friction and strain as in tennis playing, but also occurring in other exercises in which the thumb is subject to repeated pressure or strain. (05 Mar 2000) |
| thumb | The first digit on the radial side of the hand. Synonym: digitus primus, pollex, first finger. Origin: A.S. Thuma (05 Mar 2000) |
| thumb forceps | A spring forceps used by compression with thumb and forefinger. (05 Mar 2000) |
| thumb fractures | <radiology> Base of 1st metacarpal, Bennett ULNAR side, Rolando RADIAL side (mnemonic R=R), base of 1st proximal phalanx, Gamekeeper avulsion fracture (12 Dec 1998) |
| thumb lancet | A lancet with short flat blade which folds back, when closed, between two plates of the handle. (05 Mar 2000) |
| thumb reflex | Flexion of the thumb upon tapping the dorsum of the hand. Synonym: metacarpothenar reflex. (05 Mar 2000) |
| 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) |
| lady's thumb | <botany> An annual weed (Polygonum Persicaria), having a lanceolate leaf with a dark spot in the middle. Source: Websters Dictionary (01 Mar 1998) |
| long abductor muscle of thumb | <anatomy> Origin, interosseous membrane and posterior surfaces of radius and ulna; insertion, lateral side of base of first metacarpal bone; action, abducts and assists in extending thumb; nerve supply, radial. Synonym: musculus abductor pollicis longus, long abductor muscle of thumb, musculus extensor ossis metacarpi pollicis. (05 Mar 2000) |
| long extensor muscle of thumb | <anatomy, muscle> Origin, posterior surface of ulna; insertion, base of distal phalanx of thumb; action, extends distal phalanx of thumb; nerve supply, radial. Synonym: musculus extensor pollicis longus, long extensor muscle of thumb, musculus extensor longus pollicis. (05 Mar 2000) |