Humerus

The humerus is a long bone in the arm or fore-legs (animals) that runs from the shoulder to the elbow. On a skeleton, it fits between the scapula and the radius and ulna.

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At the shoulder, there is a ball-and-socket joint, where the head of the humerus caput humeri articulates with the cavitas glenoidalis of the scapula. This type of joint allows a wide range of movement.

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The distal end of the humerus (at the elbow) creates a hinge joint with the ulna, allowing only flexion and extension. This happens on the trochlea of the humerus. Two pits at this end of the humerus (the coronoid fossa and the olecranon fossa) allow the ulna room to move, but prevent it from over-flexing/extending.

Arm: ARM may stand for:...

Shoulder: :This article is about the body part. See hard shoulder for the road segment....

Elbow: The elbow is the region surrounding the elbow-joint?the ginglymus or hinge joint in the middle of the arm. Three bones form the elbow joint: the humerus of the upper arm, and the paired radius and ulna of the forearm....