What is Anconeus?
The anconeus is a small, triangular muscle located on the posterior (back) aspect of the elbow joint. It plays a minor role in elbow extension, primarily assisting the much larger triceps brachii muscle.
- Location: Posterior elbow joint. It's situated in the posterior compartment of the arm.
- Shape: Small and triangular.
- Attachment: Originates from the dorsal aspect of the lateral epicondyle of the humerus (upper arm bone) and inserts into the ulna (forearm bone). Its tendon of origin is located just proximal to the common extensor tendon.
- Function: While active during elbow extension, its contribution to this movement is minimal compared to the triceps brachii. Some sources even describe it as being sometimes blended with the triceps brachii or extensor carpi ulnaris muscles.
- Innervation: The anconeus muscle is innervated by the radial nerve.
- Variations: An anatomical variant, the anconeus epitrochlearis muscle, exists in up to 34% of individuals. This variant contributes to the roof of the cubital tunnel when present, running superficial to the ulnar nerve.
Clinical Significance
The anconeus muscle, while not a major player in elbow function, is relevant in certain clinical scenarios:
- Surgical Procedures: It can be involved in surgical procedures around the elbow, such as the use of a local pediculated anconeus flap for chronic draining sinuses of the posterior elbow.
Further Information
For more detailed anatomical information and visuals, refer to resources like:
