The ulna is one of the two bones which make up the lower forearm in tetrapods. The other one is the radius. Above them is the elbow and humerus; below are the hands or front feet.
Images for kids
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Upper extremity of left ulna. Lateral aspect.
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Vertical section through the articulations at the wrist, showing the synovial cavities.
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Bones of left forearm. Anterior aspect.
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Bones of left forearm. Posterior aspect.
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Ligaments of wrist. Anterior view
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Ligaments of wrist. Posterior view.
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Position of ulna (red). Animation
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Bones of the right arm, showing the ulna, radius, wrist and humerus
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Cross-section through the middle of the forearm, showing the two bones and the muscles, nerves and blood vessels surrounding them.
See also
In Spanish: Cúbito para niños