Muscle
Pronator quadratus
Deep primary pronator
High-yield
Deepest anterior forearm muscle; initiates pronation. Anterior interosseous nerve.
Overview
A flat quadrangular muscle deep in the distal forearm that is the prime mover of pronation and binds the radius and ulna together.
Reference facts
- Origin
- Distal anterior surface of the ulna
- Insertion
- Distal anterior surface of the radius
- Action
- Pronates the forearm; holds the radius and ulna together
- Innervation
- Anterior interosseous branch of the median nerve (C8, T1)
- Blood supply
- Anterior interosseous artery
Frequently asked questions
What does the pronator quadratus do?
The pronator quadratus pronates the forearm; holds the radius and ulna together.
What nerve innervates the pronator quadratus?
The pronator quadratus is innervated by the anterior interosseous branch of the median nerve (C8, T1).
Where does the pronator quadratus attach?
The pronator quadratus originates from the distal anterior surface of the ulna and inserts on the distal anterior surface of the radius.
What is the blood supply of the pronator quadratus?
The pronator quadratus is supplied by the anterior interosseous artery.