- The long bone in the arm which extends from the shoulder to the elbow.
* * *The bone of the arm, articulating with the scapula above and the radius and ulna below. SYN: arm bone. [L. shoulder]
* * *hu·mer·us 'hyüm-(ə-)rəs n, pl hu·meri 'hyü-mə-.rī, -.rē the longest bone of the upper arm or forelimb extending from the shoulder to the elbow, articulating above by a rounded head with the glenoid fossa, having below a broad articular surface divided by a ridge into a medial pulley-shaped portion and a lateral rounded eminence that articulate with the ulna and radius respectively, and providing various processes and modified surfaces for the attachment of muscles
* * *n.the bone of the upper arm (see illustration). The head of the humerus articulates with the scapula at the shoulder joint. At the lower end of the shaft the trochlea articulates with the ulna and part of the radius. The radius also articulates with a rounded protuberance (the capitulum) close to the trochlea. Depressions (fossae) at the front and back of the humerus accommodate the ulna and radius, respectively, when the arm is flexed or straightened.
* * *hu·mer·us (huґmər-əs) gen. and pl. huґmeri [L.] [TA] the bone that extends from the shoulder to the elbow articulating proximally with the scapula and distally with the radius and ulna; see illustration and Plate 40. humeral adj
Anterior view of right humerus.
Medical dictionary. 2011.