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
Frequently asked questions
What does the palmar interossei do?
The palmar interossei adduct the fingers toward the axial line (middle finger); assist the lumbricals.
What nerve innervates the palmar interossei?
The palmar interossei is innervated by the deep branch of the ulnar nerve (C8, T1).
Where does the palmar interossei attach?
The palmar interossei originates from the palmar surfaces of the 2nd, 4th, and 5th metacarpals and inserts on the extensor expansions and proximal phalanges of the same digits.
What is the blood supply of the palmar interossei?
The palmar interossei is supplied by the palmar metacarpal arteries.