Ulna

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Bone: Ulna
Illu upper extremity.jpg
Upper extremity
Carpus.png
Ulna is #2
Gray's subject #52 214
MeSH Ulna
Dorlands
/ Elsevier
    
u_01/12835497

WikiDoc Resources for Ulna

Articles

Most recent articles on Ulna

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Review articles on Ulna

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

Media

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Evidence Based Medicine

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Clinical Trials

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Guidelines / Policies / Govt

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Books

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Commentary

Blogs on Ulna

Definitions

Definitions of Ulna

Patient Resources / Community

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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

International

Ulna en Espanol

Ulna en Francais

Business

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Experimental / Informatics

List of terms related to Ulna


Overview

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

Articulations

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.

Structure

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

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.


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