Muscle
Palmar interossei
ADduct the fingers (PAD)
High-yield
PAD — Palmar ADduct. Ulnar nerve; loss impairs finger adduction (card-holding).
Overview
Three unipennate muscles that adduct the fingers toward the middle digit. Deep branch of the ulnar nerve.
Reference facts
- Origin
Palmar surfaces of the 2nd, 4th, and 5th metacarpals
- Insertion
Extensor expansions and proximal phalanges of the same digits
- Action
Adduct the fingers toward the axial line (middle finger); assist the lumbricals
- Innervation
Deep branch of the ulnar nerve (C8, T1)
- Blood supply
Palmar metacarpal arteries