Anconeus Anatomy

Anconeus Muscle

Origin:  Posterior surface of the lateral epicondyle of the humerus
Insertion: Lateral aspect of the olecranon, extending to the lateral part of the ulnar body
Actions: Extension of the forearm at the elbow
Innervation: Radial nerve (C7 C8)
Blood Supply: Profunda brachii artery from the brachial artery

Primary Actions of the Anconeus

Due to its small size, the anconeus does not have any primary actions.

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Secondary Actions of the Anconeus

1. Extension of the forearm at the elbow

  Agonists:

  • Triceps Brachii

  Antagonists:

  • Brachialis
  • Biceps Brachii

Anconeus is a weak extensor of the elbow, but acts primarily to pull the synovium of the elbow joint out of the joint line during extension of the elbow.