The primary muscle located between the ulna and radius in the forearm is the pronator quadratus.
The pronator quadratus is a small, quadrilateral-shaped muscle found in the distal part of the forearm. It's the main muscle responsible for pronation, which is the movement that turns the palm of the hand downwards.
Here's a breakdown:
- Location: Distal (farthest from the elbow) aspect of the forearm.
- Origin: Distal anteromedial surface of the ulna.
- Insertion: Distal anterolateral surface of the radius.
- Function: Pronates the forearm, turning the palm downwards. It also helps to stabilize the distal radioulnar joint.
In summary, while other muscles in the forearm region cross or are somewhat related to the ulna and radius, the pronator quadratus is the most directly situated between these two bones and crucial for their relative movement.
