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Anconeus Muscle
Muscular System

Anconeus Muscle

Musculus anconeus

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Quick Facts

Origin: Posterior aspect of lateral epicondyle of humerus.

Insertion: Olecranon; proximal end of body of ulna.

Action: Extends forearm at elbow joint.

Innervation: Radial nerve (C7-C8).

Arterial Supply: Recurrent interosseous artery.

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Origin

The anconeus muscle originates from the posterior aspect of the lateral epicondyle of the humerus. This origin site is located superior to the attachment site of the common extensor tendon.

Insertion

The fibers of the anconeus muscle travel inferomedially and insert onto the:

- posterolateral aspect of the olecranon;

- posterolateral aspect of the proximal end of the body of ulna.

Key Features & Anatomical Relations

The anconeus muscle is found in the posterior compartment of the arm. It is a short, triangular skeletal muscle whose fibers can be found merged with those of the triceps brachii muscle. It is located:

- posterior (superficial) to the elbow joint and the annular ligament of radius;

- medial to the extensor carpi ulnaris muscle;

- lateral to the flexor carpi ulnaris muscle.

Actions

The anconeus muscle assists in extension of the forearm at the elbow joint (Standring, 2016).

References

Standring, S. (2016) Gray's Anatomy: The Anatomical Basis of Clinical Practice. Gray's Anatomy Series 41st edn.: Elsevier Limited.

Actions

The anconeus muscle assists in extension of the forearm at the elbow joint (Standring, 2016).

Learn more about this topic from other Elsevier products

Anconeus Muscle

ScienceDirect image

The anconeus muscle is a triangular-shaped muscle originating posterior to the lateral epicondyle of the humerus and then fanning out broadly for an insertion base on the proximal part of the posterolateral side of the ulna.

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