Pronator quadratus
Musculus pronator quadratus
MuscularDeep musclesArmLeft and right
View left in 3D View right in 3D
- What it is
- Flat square muscle deep in the lower forearm, stretching across from the lower quarter of the front of the ulna to that of the radius.
- Function
- The prime mover of pronation; also binds the lower ends of radius and ulna together.
- Size
- About 4–5 cm square and ~5 mm thick.
- Clinical note
- It is lifted off the radius in the standard volar approach for plating distal radius fractures.