Second palmar interosseous muscle - MRI finger of hand - Axial PD FS - e-Anatomy
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Second palmar interosseous muscle

Tendo musculi interossei palmaris secondi

Definition

Muhammad A. Javaid

Second palmar interosseous muscle

Origin

From the lateral side of the palmar surface of the fourth metacarpal bone (ring finger)

Insertion

Proximal phalanx and extensor hood (extensor expansion) of the 4th digit (ring finger)

Innervation

Deep branch of the ulnar nerve (C8, T1)

Action

Adduction of the ring finger

The second palmar interosseous muscle arises from the radial side of the fourth metacarpal bone. It inserts into the radial side of the base of the proximal phalanx of the ring finger and its extensor hood, enabling adduction of the ring finger towards the middle finger.

The palmar interossei also assist in flexion at the metacarpophalangeal joints and extension at the interphalangeal joints via their insertion into the extensor expansion.

References

  • Valenzuela M, Bordoni B. Anatomy, Shoulder and Upper Limb, Hand Palmar Interosseous Muscle. [Updated 2025 Apr 27]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK537165/

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