Muscle Anatomy

extensor digiti minimi

The Extensor Digiti Minimi muscle is located in the forearm and characterized by its slender and elongated structure. Positioned along the ulnar aspect of the forearm, it contributes to the intricate network of muscles controlling hand and finger movements.

Originating from the lateral epicondyle of the humerus and the adjacent antebrachial fascia, the Extensor Digiti Minimi takes its starting point from the bony prominence on the outer side of the elbow joint and the connective tissue covering the forearm.

The muscle inserts at the dorsal aspect of the base of the little finger's proximal phalanx and extends to the dorsal expansion of the finger's capsule. This insertion site establishes a critical connection with the finger's skeletal structure, influencing its extension.

Functionally, the Extensor Digiti Minimi is primarily responsible for extending the little finger at the metacarpophalangeal (MCP) joint. It contributes to the overall extension of the hand, aiding in activities that involve straightening and spreading the fingers. Additionally, the muscle plays a role in stabilizing the MCP joint during fine motor tasks and precise hand movements, showcasing its importance in finger dexterity.