Anconeus muscle
The anconeus muscle (or anconaus/anconæus) is a small muscle on the posterior aspect of the elbow joint.
Some consider anconeus to be a continuation of the triceps brachii muscle.[1][2][3] Some sources consider it to be part of the posterior compartment of the arm,[4] while others consider it part of the posterior compartment of the forearm.[5]
The Anconeus muscle can easily be palpated just lateral to the olecranon process of the ulna.
Function
Its function is trivial in humans. It assists in extension of the elbow, where the triceps brachii is the principal agonist. It also prevents the elbow joint capsule being pinched in the olecranon fossa during extension of the elbow. Anconeus also abducts the ulna and stabilizes the elbow joint.
Innervation
Anconeus is innervated by the radial nerve (cervical roots 6, 7, and 8) from the posterior cord of the brachial plexus. The somatomotor portion of radial nerve innervating anconeus bifurcates from the main branch in the radial groove of the humerus. This innervation pattern follows the rules of innervation of the musculature of the posterior forearm (extensor) compartment by the radial nerve.
Additional images
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Left humerus. Posterior view.
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Bones of left forearm. Posterior aspect.
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Posterior surface of the forearm. Deep muscles.
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Arteries of the back of the forearm and hand.
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The suprascapular, axillary, and radial nerves.
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References
- ^ Williams, P. et al., 1995, Gray's Anatomy, 38th ed., Churchill Livingstone
- ^ Jones, W. et al.(eds) , 1953, Buchanan's Manual of Anatomy, 8th ed., Balliére, Tindall and Cox., pp. 496
- ^ Grant, J. & Basmajian J., 1965, Grant's Method of Anatomy, 7th ed., The Williams & Wilkins Company, Baltimore, pp. 163-164
- ^ "Dissector Answers — Axilla & Arm". http://anatomy.med.umich.edu/musculoskeletal_system/axilla_ans.html. Retrieved 2008-01-17.
- ^ "The Radius and Ulna". Archived from the original on 2008-06-11. http://web.archive.org/web/20080611032919/http://www.med.mun.ca/anatomyts/msk/forearm.htm. Retrieved 2008-01-17.
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