Origin Dorsal: metacarpal bones 1 to 5. Palmar: metacarpal bones of digits 2, 4, and 5. Insertion Dorsal: bases of proximal phalanges and extensor expansions of digits 2 to 4. Palmar: base of proximal phalanx and extensor expansion of the same digit from which it originated. Actions Dorsal: Abduct digits. Palmar: Adduct digits. | ||
The interosseous muscles of the hand are muscles found near the metacarpal bones that help to control the fingers. They are considered voluntary muscles.
They are generally divided into two sets:
This is often remembered by the mnemonic PAD-DAB, as the Palmar interosseous muscles ADduct, and the Dorsal interosseous muscles ABduct. The axial line goes down the middle of the 3rd digit, towards the palm of the hand (it's an imaginary line).
Both sets of muscles are innervated by the deep branch of the ulnar nerve.
References
Interosseous muscles of the hand Wikipedia(Text) CC BY-SA