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Anconeus Muscle: Definition, Function & Innervation

Instructor: Artem Cheprasov

Artem has a doctor of veterinary medicine degree.

This lesson goes over the definition, function, innervation, as well as blood supplied of the anconeus muscle. You'll learn where it's located and what daily things it helps you do.

Anconeus Definition

We extend our arm to greet people as we shake their hands. We extend our arm to give someone a high five. When we do these seemingly mundane things, we use a lot of different muscles. One of these muscles is anconeus, which is a relatively small muscle found near the elbow joint.

Let's find out what it does and a bit about its innervation and blood supply.

Function

Anconeus has a couple of different functions. The first one is to act as a little assistant to the triceps. The triceps are at work on your arm when you extend it to shake someone's hand or to give someone a high five. So, anconeus assists the triceps in extending our arm. More specifically, it assists in extending the arm at the elbow.

The other major function of anconeus is to abduct the ulna during pronation. Abduction refers to moving something away from the midline of our body. Pronation refers to the turning of the forearm in such a manner so as to have the palms of the hands face downward or backward.

Anconeus.
Anconeus.

Innervation & Blood Supply

The anconeus muscle is innervated by the radial nerve as well as C6, C7, and C8. C6, C7, and C8 are all spinal nerves. The ''C'' in C6, C7, and C8 stands for ''cervical,'' which refers to the area of the neck.

The muscle is supplied with freshly oxygenated blood via branches of the posterior interosseous recurrent artery. This artery lies deep to the anconeus. In other words, it lies ''underneath'' the anconeus muscle, and the artery moves between the lateral epicondyle and olecranon.

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