Radial

(ra'-de-al). Pertaining to the radius or bone of the forearm. In biology, diverging from a common center. Relating to the radiating proce es of animals, or to the ray of an umbel, or the ligulate corolla of an outer floret of Composite. Gcebel uses it in opposition to bifacial or dorsoventral. R. Artery. See Artery . R. Aspect, the aspect or view from the side on which the radius is situated. R. Bundle, in biology, a fibro-vascular bundle in which the xylem is arranged in rays, with the phloem in intervening rays or ma es. R. Fibers (of the Retina), Miiller's fibers. R. Fo a, a depre ion on the humerus for the reception of the head of the radius in flexion. R. Glands, lymphatic glands of the forearm following the radial ve els. R. Nerve. See Nerve . R. Tap, percu ion of the lower end of the radius to elicit the reflex contraction of the biceps and supinator long us. R. Veins. See Veins.