Word of the Day – Tuesday, February 20th



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ULNA (UHL-nuh)

The bone on the little finger side of the human forearm
Common clues:
Inner forearm bone; Humerus neighbor; Arm bone; Forearm bone; Radius neighbor; Elbow-wrist connection; It parallels a radius; Bone under a watch
Related crosswordese: ULNAR; ULNAE
Crossword puzzle frequency: 8 times a year
Frequency in English language: 65105 / 86800
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Anterior Bone Landmarks (Radius and Ulna)

The ulna (elbow bone) is a long bone, prismatic in form, placed at the medial side of the forearm, parallel with the radius.

da Vinci, Arm Study, c. 1510

The ulna articulates with:

  • the humerus, at the elbow as a hinge joint.

  • the radius, near the elbow as a pivot joint, this allows the radius to cross over the ulna in pronation.

  • the distal radius, where it fits into the ulna notch.

  • the radius along its length via the interosseous membrane that forms a syndesmoses joint.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ulna"