Extensor digiti minimi

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Extensor digiti minimi
Extensor digiti minimi.GIF
System: Muscle
Function: Extends the little finger
Origin: Common extensor origin
Insertion: Extensor expansion of the little finger
Arterial supply:
Venous drainage:
Lymphatic drainage:
Innervation: Posterior interosseous nerve (C7, C8)
Vertebral levels:
Search for Extensor digiti minimi in Gray's.

Extensor digiti minimi (extensor digiti quinti proprius) is a muscle of the forearm that extends the little finger.



Extensor digiti minimi is a slim muscle located on the medial side of extensor digitorum. It connects directly with the latter muscle. Its tendon runs through a compartment of the extensor retinaculum behind the distal radioulnar joint, and divides in two as it crosses the hand to reach its insertion.


Joints Affected

  • All joints of the little finger



Nerve Supply


  • May have a slip from the lateral epicondyle of the radius
  • Tendon may not divide
  • May send a tendon to the ring finger
  • Rarely absent
  • Often completely fused with extensor digitorum

See Also

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