| shaft of ulna | The shaft of the ulna between the proximal extremity and the head. Synonym: body of ulna. (05 Mar 2000) |
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| neck-shaft angle | <orthopaedics> The angle formed by the meeting of a line drawn through the shaft of the femur with one passing through the long axis of the femoral neck; normally it is about 127 |
| annular ligament of the radius | The ligament that encircles and holds the head of the radius in the radial notch of the ulna, forming the proximal radioulnar joint and enabling pronation/supination of forearm; receives the radial collateral ligament of the elbow. Synonym: ligamentum annulare radii, ligamentum orbiculare radii, orbicular ligament of radius. (05 Mar 2000) |
| anterior border of radius | The ridge on the shaft of the radius extending from the radial tuberosity to the anterior part of the styloid process. Synonym: margo anterior radii. (05 Mar 2000) |
| anterior surface of radius | The anterior surface of the radius. Synonym: facies anterior radii. (05 Mar 2000) |
| articular circumference of radius | The portion of the head of the radius that articulates with the radial notch of the ulna. Synonym: circumferentia articularis radii. (05 Mar 2000) |
| articular pit of head of radius | The depression on the top (superior surface) of the head of the radius for articulation with the capitulum of the humerus. Synonym: fovea articularis capitis radii, articular pit of head of radius. (05 Mar 2000) |
| radius | One of two bones which constitute the forearm. The largest portion of the radius is at the wrist joint where it articulates with the carpal bones of the hand. Above, the radius articulates with the humerus at the elbow joint. Bony injury (fracture) to the radius occurs most commonly at the wrist. (27 Sep 1997) |
| radius fixus | A line passing from the hormion to the inion. (05 Mar 2000) |
| radius vector | 1. <mathematics> A straight line (or the length of such line) connecting any point, as of a curve, with a fixed point, or pole, round which the straight line turns, and to which it serves to refer the successive points of a curve, in a system of polar coordinates. See Coordinate. 2. <astronomy> An ideal straight line joining the center of an attracting body with that of a body describing an orbit around it, as a line joining the sun and a planet or comet, or a planet and its satellite. Source: Websters Dictionary (01 Mar 1998) |
| carpal articular surface of radius | The biconcave distal surface of the radius for articulation with the scaphoid bone laterally and the lunate medially. Synonym: facies articularis carpi radii. (05 Mar 2000) |
| posterior border of radius | The ridge on the radius that extends from the tuberosity to the tubercle on the posterior aspect of the distal extremity. Synonym: margo posterior radii. (05 Mar 2000) |
| posterior surface of radius | The posterior surface of the radius. Synonym: facies posterior radii. (05 Mar 2000) |
| cyclotron radius | <radiobiology> Radius of orbit of charged particle about a magnetic field line. Synonym: gyroradius, Larmor radius. (09 Oct 1997) |
| head of radius | The disk-shaped upper extremity articulating with the capitulum of the humerus. Synonym: caput radii. (05 Mar 2000) |