Palmar Interossei of the Hand

Authors
Affiliations

Nate 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

Figure 1: Intrinsic Muscles of the Hand

Palmar Interossei of the hand (left)2

Palmar Interossei of the hand (left)
Reading list
  • Interosseous, Lumbrical, and Abductor Digiti Minimi Muscles

Origin

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

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

Insertion

Palmar surface of metacarpals 2,4,5

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

Innervation

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

Action

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

  • 2,4,5 MCP: Flexion
  • 2,4,5 PIP, DIP: Extension, Adduction

Notes

1.
Betts JG, Blaker W. Anatomy and Physiology. 2nd ed. OpenStax; 2022. https://openstax.org/details/books/anatomy-and-physiology-2e/?Book%20details
2.
Gray H. Anatomy of the Human Body. 20th ed. (Lewis WH, ed.). Lea & Febiger; 1918. https://www.bartleby.com/107/
3.
Donnelly JM, Simons DG, eds. Travell, Simons & Simons’ Myofascial Pain and Dysfunction: The Trigger Point Manual. Third edition. Wolters Kluwer Health; 2019.
4.
Neumann DA, Kelly ER, Kiefer CL, Martens K, Grosz CM. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. 3rd ed. Elsevier; 2017.
5.
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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