Anconeus muscle

Last revised by Peter Ikeuchi on 13 Apr 2023

The anconeus muscle is a small muscle in the posterior compartment of the arm at the lateral aspect of the elbow. Its functional significance is not well understood 5.

An accessory muscle, anconeus epitrochlearis is present in up to one third of people, and may be implicated in some cases of cubital tunnel syndrome 4.


Related pathology

In chronic cases of lateral epicondylitis (tennis elbow) increased signal intensity of the nearby anconeus muscle may be an associated finding. 

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Cases and figures

  • Figure 1: posterior elbow
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  • Figure 2: posterior elbow
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  • Case 1: normal anconeus muscle
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