Which of the following muscles is a flexor of the hand?Multiple choice question.palmaris longuspronator quadratussupinator

Step 1: Break Down the Problem

We need to identify which of the provided muscles functions as a flexor of the hand from the following options:

1. Palmaris longus
2. Pronator quadratus
3. Supinator

Step 2: Relevant Concepts

• Hand Flexors: The flexor muscles of the hand primarily originate from the anterior compartment of the forearm. One of the main flexor muscles is the palmaris longus.
• Pronator Quadratus: This muscle is responsible for pronation of the forearm but does not flex the hand.
• Supinator: This muscle functions to supinate the forearm, also not affecting hand flexion.

Step 3: Analysis and Detail

• Palmaris Longus: This muscle arises from the medial epicondyle of the humerus and inserts into the palmar aponeurosis. It assists in flexing the hand at the wrist.
• Pronator Quadratus: Located in the distal forearm, it acts primarily to pronate the forearm.
• Supinator: It is located near the elbow and serves to supinate the forearm.

Step 4: Verify and Summarize

Among the muscles listed, the palmaris longus is a recognized flexor of the hand. The other two, pronator quadratus and supinator, do not facilitate hand flexion.

Final Answer

The muscle that is a flexor of the hand is palmaris longus.