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