Anatomy
Origin:
Entire length of side of metacarpal (1st = ulnar aspect, 2nd, 3rd = radial aspect)
Insertion:
Extensor hood and base of proximal phalanges of the index, middle and ring fingers.
Functions
Flexion of the index, middle and ring digits at the metacarpophalangeal joint.
Adducts the index, middle and ring digits at the metacarpophalangeal joint.
Working synergistically with the lumbricals extends the digits at the interphalangeal joints.
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Supply
Nerve Supply:
Deep branch of the ulnar nerve (C8, T1).
Blood Supply:
Dorsal palmar metacarpal arteries.
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