Brachialis muscle

Changed by Daniel J Bell, 21 Aug 2019

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Brachialis muscle

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The brachialis muscle (brachialis) is one of the three muscles of the anterior compartment of the arm. It is only involved in flexion at the elbow and therefore the strongest flexor at the elbow, compared with the biceps brachii which is also involved in supination because of its insertion on the radius.

Summary

origin: lower portion of the anterior surface of the humerus
insertion: ulna tuberosity and coronoid process of the ulna
innervation: musculocutaneous nerve and radial nerve (proprioceptive branch)
action: flexion at the elbow

Variant anatomy

Although rare, supernumerary heads of brachialis have been reported and may cause entrapment of the median nerve and/or brachial artery ³.

-<p>The <strong>brachialis muscle</strong> (<strong>brachialis</strong>) is one of the three muscles of the <a href="/articles/anterior-compartment-of-the-arm">anterior compartment of the arm</a>. It is only involved in flexion at the elbow and therefore the strongest flexor at the elbow, compared with the <a href="/articles/biceps-brachii">biceps brachii</a> which is also involved in supination because of its insertion on the radius.</p><h4>Summary</h4><ul>
+<p>The <strong>brachialis muscle</strong> (<strong>brachialis</strong>) is one of the three muscles of the <a href="/articles/anterior-compartment-of-the-arm">anterior compartment of the arm</a>. It is only involved in flexion at the elbow and therefore the strongest flexor at the elbow, compared with the <a href="/articles/biceps-brachii-muscle-1">biceps brachii</a> which is also involved in supination because of its insertion on the radius.</p><h4>Summary</h4><ul>

References changed:

3. Vadgaonkar R, Rai R, Ranade AV, Nayak SR, Pai MM, Lakshmi R. A case report on accessory brachialis muscle. (2008) Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie. 49 (4): 581-3. <a href="https://www.ncbi.nlm.nih.gov/pubmed/19050812">Pubmed</a> <span class="ref_v4"></span>
3. Vadgaonkar R, Rai R, Ranade AV, Nayak SR, Pai MM, Lakshmi R. A case report on accessory brachialis muscle. (2008) Romanian journal of morphology and embryology