Extensor Digiti Minimi

Extensor Digiti Minimi

Upgrade to Shiken Premium Call To Action Banner

Extensor Digiti Minimi

The extensor digiti minimi is a muscle located within the superficial compartment of the posterior forearm. Its tendon passes through the fifth compartment at the wrist. This muscle originates from the lateral epicondyle of the humerus and attaches to the extensor hood of the little finger.

The extensor digiti minimi is responsible for the extension of the little finger, as well as providing a weak extensor movement to the wrist. It is innervated by the radial nerve's deep branch and receives its blood supply from the radial artery.


The extensor digiti minimi allows for full extension of the little finger, although it can also be used for a range of other related functions. These include:

  • Providing extension of the little finger
  • Enables lateral spread of the fingers
  • Assists in pivoting and flicking of the little finger
  • Enables precise control of the little finger's movement

The extensor digiti minimi can be used to aid in the performance of fine motor skills, such as threading a needle and fastening/unfastening small buttons. It can also be used in activities like typing or playing a musical instrument, where precise control of the little finger's movement is required.

Injury to the Muscle

Injury to the extensor digiti minimi can occur through overuse or repetitive motion activities, such as playing a musical instrument, typing, or using a gaming controller over extended periods of time. It can also be caused by direct trauma, such as a fall, which can stretch or tear the muscle.

Symptoms of a strain or tear in the extensor digiti minimi muscle include pain and tenderness at the lateral epicondyle, swelling at the point of injury, and weakened grip strength in the hand. If the injury is severe enough, it can cause a loss of sensitivity or feeling in the affected area. Treatment for a strained or torn extensor digiti minimi muscle may include rest, ice, compression, elevation, and taking non-steroidal anti-inflammatory medications. Surgical treatment may be required in more severe cases.


The extensor digiti minimi is a small muscle located within the posterior forearm. Its primary function is to assist in the extension of the little finger. Injury to the muscle can occur through overuse or direct trauma, and may require medical treatment depending on the severity. It is important to be aware of the functioning of this muscle in order to maintain its health and prevent potential injury.

Explore More Subject Explanations

Try Shiken Premium
for Free

14-day free trial. Cancel anytime.
Get Started
Join 10,000+ learners worldwide.
The first 14 days are on us
96% of learners report x2 faster learning
Free hands-on onboarding & support
Cancel Anytime