Orris

Complete ulnar bone

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ulna bone anatomy

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The ulna is one of the two long bones of the forearm (the other is the radius), on the medial side in anatomical position (little-finger side).
A complete description includes:
  • Proximal end
    • Olecranon process (posterior prominence, tip of elbow)
    • Coronoid process (anterior projection)
    • Trochlear (semilunar) notch between olecranon and coronoid, articulates with humeral trochlea
    • Radial notch for proximal radioulnar joint
    • Ulnar tuberosity for brachialis insertion
  • Shaft (body)
    • Triangular in much of its course
    • Has 3 borders (anterior, posterior, interosseous) and 3 surfaces (anterior, posterior, medial)
    • Interosseous border gives attachment to the interosseous membrane
  • Distal end
    • Head of ulna (articulates with radius at distal radioulnar joint)
    • Styloid process (medial/posterior projection)
    • Separated from carpal bones by the articular disc (TFCC) rather than direct ulno-carpal articulation
Source: Imaging anatomy text and atlas Volume 3, Bones, joints, Vessels and Nerves, p. 96.
If you meant “complete ulna” as in ossification centers, side determination, or clinical fractures (nightstick, Monteggia, etc.), tell me which one and I will give that exact format.
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