Palmar Interossei of the Hand

Authors
Affiliations

Nathaniel Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

Muscle Origin Insertion Innervation Action
Palmar interossei (hand)

Origin

Base of prox phalanx and extensor expansion of digits 2,4,5

  • 1st: 2nd metacarpal (ulnar side)1
  • 2nd: 4th metacarpal (radial side)1
  • 3rd: 5th metacarpal (radial side)1

Insertion

Palmar surface of metacarpals 2,4,5

  • 1st: 2nd DDE, 2nd proximal phalanx (base)1
  • 2nd: 4th DDE, 4th proximal phalanx (base)1
  • 3rd: 5th DDE, 5th proximal phalanx (base)1

Innervation

Deep Br. of Ulnar N. (C8, T1)1

Action

2nd, 4th, and 5th digits: • MCP joints: flexion • Proximal and distal IP joints: extension and adduction toward 3rd digit

  • 2,4,5 MCP: Flexion1
  • 2,4,5 PIP, DIP: Extension, Adduction1

Notes

1.
Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.

Citation

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