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Extensor digiti minimi muscle

Synonyms: little finger extensor, extensor digiti quinti proprius muscle
German: Musculus extensor digiti minimi

1 Definition

The extensor digiti minimi muscle is a lean muscle that belongs to the superficial layer of extensors of the forearm.

From a functional perspective, this muscle is a part of the extensor digitorum muscle. However, it has a separate tendon and its own tendon compartment, so that it is regarded a separate muscle.

2 Devolution

2.1 Origin

The extensor digiti minimi muscle has its origin at the lateral epicondyle of the humerus, medial to the extensor digitorum muscle. Moreover, it has surfaces of origin at the septa that separate it from the neighboring muscles.

2.2 Insertion

The muscle passes almost in the middle of the dorsal side of the forearm and ends in a flat tendon that passes further on to the wrist. The tendon reaches the back of the hand below the extensor retinaculum in its own tendon sheath and end at the base of the 5th finger. There, it unites with the dorsal aponeurosis of the 5th finger and inserts at its middle and end phalanx (medial and distal phalanges).

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3 Innervation

The innervation of the extensor digiti minimi muscle is provided by the profound branch of the radial nerve, with fibers from the C6 to the C8 segments.

4 Function

The extensor digiti minimi muscle effects an extension of the 5th Finger (digitus V). Moreover, it supports the ulnar abduction in the wrist.

Specialties: Anatomy

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