Anconeus

From Ganfyd

Anconeus is a small muscle that acts weakly in extension and pronation of the forearm.

Shape

Anconeus
System:	Muscle
Function:	Extension of elbow, ulnar movement in pronation
Origin:	Posterior aspect of lateral epicondyle of humerus
Branches:
Insertion:	Lateral side of olecranon of ulna
Arterial supply:
Venous drainage:
Lymphatic drainage:
Innervation:	Radial nerve (C7, C8)
Vertebral levels:
Search for Anconeus in Gray's.

Anconeus is a small triangular muscle on the posterior aspect of the elbow. Its fibres diverge from the tendon of origin to a relatively larger insertion.

Anconeus may represent an extension of triceps, although there is no direct connection between the two tendons.

Actions

• Weakly extends the forearm at the elbow
• Helps in pronation of the ulna at the radioulnar joints

Joints Affected

• Elbow
• Radioulnar joints

Origin

• A smooth area of the posterior surface of the lateral epicondyle of the humerus

Insertion

• Lateral side of the olecranon of the ulna
• Upper quarter of the posterior surface of the ulna

Nerve Supply

• Radial nerve (C7, C8)