| radial nerve | <anatomy, nerve> A major nerve of the upper extremity. In humans the fibres of the radial nerve originate in the lower cervical and upper thoracic spinal cord (usually c5 to t1), travel via the posterior cord of the brachial plexus, and supply motor innervation to extensor muscles of the arm and cutaneous sensory fibres to extensor regions of the arm and hand. (12 Dec 1998) |
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| groove for radial nerve | <anatomy, nerve> The shallow groove that passes around the shaft of the humerus; it lodges the radial nerve and deep brachial artery. Synonym: sulcus nervi radialis, musculospiral groove, spiral groove. (05 Mar 2000) |
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| superficial branch of the radial nerve | <anatomy, nerve> Cutaneous terminal branch (with deep branch) which runs under cover of brachioradialis muscle to wrist, then supplies skin of proximal portion of the dorsal aspects of thumb, index, middle and lateral half of ring fingers and the portion of the dorsum of the hand located proximally. Synonym: ramus superficialis nervi radialis. (05 Mar 2000) |
| deep branch of the radial nerve | <anatomy, nerve> The deep terminal branch of the radial nerve, arises in the cubital region, penetrating and supplying the supinator and continuing with the posterior interosseous artery to supply all the extensor muscles in the forearm. Synonym: nervus interosseus posterior, nervus antebrachii posterior, deep branch of the radial nerve, dorsal interosseous nerve, nervus interosseus dorsalis, posterior antebrachial nerve. (05 Mar 2000) |
| ulnar communicating branch of superficial radial nerve | <anatomy, nerve> Ulnar communicating branch of superficial branch of radial nerve, joining the dorsal branch of the ulnar nerve in the hand conveying sensation from the dorsal aspect of adjacent sides of the middle and ring fingers. Synonym: ramus communicans ulnaris nervi radialis. (05 Mar 2000) |
| radial | <botany> Of or pertaining to a radius or ray; consisting of, or like, radii or rays; radiated; as, the radial artery. Radial symmetry. <biology> See Symmetry. Origin: Cf. F. Radial. See Radius. Source: Websters Dictionary (01 Mar 1998) |
| radial acceleration | The centripetal acceleration of a particle or vehicle moving along a curved path at a constant velocity; e.g., turning a curve in an automobile, pulling out of a dive, or performing a loop manoeuvre in an aircraft. In aviation, acceleration varies directly with the square of the air speed and inversely with the radius of the turn (a = V2/r, where V is air speed and r is radius of turn). (05 Mar 2000) |
| radial aplasia-thrombocytopenia syndrome | <syndrome> Aplasia (absence) of the radius (the long bone on the thumb-side of the forearm) and thrombocytopenia (low blood platelets) are key features characterizing this syndrome. There is phocomelia (flipper-limb) with the thumbs always present. The fibula (the smaller bone in the lower leg) is often absent. The risk of bleeding from too few platelets is high in early infancy but lessens with age. The condition is inherited in an autosomal recessive trait with one gene (on a non-sex chromosome) coming from each parent to the child affected with the disease. Alternative names include thrombocytopenia-absent radius syndrome, tar syndrome, and tetraphocomelia-thrombocytopenia syndrome. (12 Dec 1998) |
| radial artery | <anatomy, artery> The direct continuation of the brachial trunk, originating at the bifurcation of the brachial artery opposite the neck of the radius. Its branches may be divided into three groups corresponding to the three regions in which the vessel is situated, the forearm, wrist, and hand. (12 Dec 1998) |
| radial border of forearm | An imaginary line running along the outermost extent of the forearm separating anterior and posterior surfaces laterally. Synonym: margo lateralis antebrachii, margo radialis antebrachii, radial border of forearm. (05 Mar 2000) |
| radial bursa | <anatomy> The synovial sheath that envelops the tendon of the flexor pollicis longus in its course through the carpal canal; it is continuous with the digital sheath of the thumb, the two generally being considered as one sheath. Synonym: vagina tendinis musculi flexoris pollicis longi, radial bursa. (05 Mar 2000) |
| radial clubhand | Clubhand with angular deviation towards radial side of limb. See: manus valga. (05 Mar 2000) |
| radial collateral artery | <anatomy, artery> The anterior terminal branch of the profunda brachii, anastomosing with the radial recurrent, forming part of the articular network of the elbow. Synonym: arteria collateralis radialis. (05 Mar 2000) |
| radial collateral ligament | The ligament that connects the lateral epicondyle of the humerus with the annular ligament of the radius. Synonym: ligamentum collaterale radiale, lateral ligament of elbow, radial collateral ligament. (05 Mar 2000) |
| radial collateral ligament of elbow | The ligament that connects the lateral epicondyle of the humerus with the annular ligament of the radius. Synonym: ligamentum collaterale radiale, lateral ligament of elbow, radial collateral ligament. (05 Mar 2000) |
| radial collateral ligament of wrist | The ligament that extends distally from the styloid process of the radius to the carpal bones. Synonym: ligamentum collaterale carpi radiale, external collateral ligament of wrist, lateral ligament of wrist. (05 Mar 2000) |