Which muscle serves as the prime mover to pronate the forearm?Group of answer choicesPronator quadratusSupinatorPyramidalisPsoas majorPeroneus longus

To determine which muscle serves as the prime mover to pronate the forearm, we need to analyze the options provided.

1. Pronator Quadratus: This is the primary muscle responsible for pronating the forearm. It is a square-shaped muscle located in the distal forearm and plays a crucial role in rotating the radius over the ulna during pronation.

2. Supinator: This muscle acts antagonistically to the pronator muscles. Its primary function is to supinate the forearm, making it the opposite of what we are looking for regarding pronation.

3. Pyramidalis: This small muscle is located in the lower abdomen. It does not have any function related to forearm movement or pronation.

4. Psoas Major: This muscle is primarily involved in hip flexion, not in the movement of the forearm.

5. Peroneus Longus: This muscle is situated in the lateral compartment of the leg and is involved in ankle movements, with no role in forearm pronation.

Conclusion

The muscle that serves as the prime mover to pronate the forearm is the Pronator Quadratus.