Which combination correctly lists the main elbow flexors?

• A. Biceps brachii, brachialis, brachioradialis
• B. Triceps brachii, anconeus, supinator
• C. Brachialis, brachioradialis, pronator teres
• D. Brachialis, biceps brachii, pronator teres

Answer: (A)

Elbow flexion is produced mainly by three muscles that cross the elbow on the front side. Biceps brachii, brachialis, and brachioradialis are the primary elbow flexors. Biceps brachii is a strong flexor, especially when the forearm is supinated. Brachialis lies deeper and is the pure elbow flexor, contributing regardless of forearm position. Brachioradialis acts as a flexor most effectively when the forearm is in a neutral/mid-pronation position, providing quick elbow flexion in that stance.

The other options mix muscles that do not primarily flex the elbow: the triceps brachii and anconeus extend the elbow; supinator primarily rotates the forearm; and pronator teres mainly pronates the forearm and only assists with flexion rather than being a main elbow flexor.

Thus, the combination that best represents the main elbow flexors is biceps brachii, brachialis, and brachioradialis.