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Template:Infobox Bone

WikiDoc Resources for Ulna


Most recent articles on Ulna

Most cited articles on Ulna

Review articles on Ulna

Articles on Ulna in N Eng J Med, Lancet, BMJ


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Evidence Based Medicine

Cochrane Collaboration on Ulna

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Clinical Trials

Ongoing Trials on Ulna at Clinical Trials.gov

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Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Ulna

NICE Guidance on Ulna


FDA on Ulna

CDC on Ulna


Books on Ulna


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Definitions of Ulna

Patient Resources / Community

Patient resources on Ulna

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Directions to Hospitals Treating Ulna

Risk calculators and risk factors for Ulna

Healthcare Provider Resources

Symptoms of Ulna

Causes & Risk Factors for Ulna

Diagnostic studies for Ulna

Treatment of Ulna

Continuing Medical Education (CME)

CME Programs on Ulna


Ulna en Espanol

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Ulna in the Marketplace

Patents on Ulna

Experimental / Informatics

List of terms related to Ulna


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


The ulna articulates with:

Proximal and distal aspects

The ulna is broader proximally, and narrower distally.

Proximally, the ulna has a bony process, the olecranon process, a hook-like structure that fits into the olecranon fossa of the humerus. This prevents hyperextension and forms a hinge joint with the trochlea of the humerus. There is also a radial notch for the head of the radius, and the ulnar tuberosity to which muscles can attach.

Distally (near the hand), there is a styloid process.


The long, narrow medullary cavity is enclosed in a strong wall of compact tissue which is thickest along the interosseous border and dorsal surface.

At the extremities the compact layer thins.

The compact layer is continued onto the back of the olecranon as a plate of close spongy bone with lamellæ parallel.

From the inner surface of this plate and the compact layer below it trabeculæ arch forward toward the olecranon and coronoid and cross other trabeculæ, passing backward over the medullary cavity from the upper part of the shaft below the coronoid.

Below the coronoid process there is a small area of compact bone from which trabeculæ curve upward to end obliquely to the surface of the semilunar notch which is coated with a thin layer of compact bone.

The trabeculæ at the lower end have a more longitudinal direction.

See also

Additional images

External links

Template:Gray's Template:Bones of upper extremity

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