Which muscle flexes the elbow and originates on the anterior distal humerus, inserting at the tuberosity of the ulna?

Which muscle flexes the elbow and originates on the anterior distal humerus, inserting at the tuberosity of the ulna?

• A. Flexor Carpi Radialis
• B. Brachialis
• C. Brachioradialis
• D. Palmaris Longus

Answer: (B)

The main idea is identifying the muscle whose origin and insertion match elbow flexion. The brachialis starts on the distal anterior surface of the humerus and inserts on the tuberosity of the ulna. When it contracts, it pulls the ulna toward the humerus, producing flexion at the elbow. This makes it the primary elbow flexor in this description. The other muscles don’t fit the clue: flexor carpi radialis and palmaris longus arise from the medial epicondyle and mainly act on the wrist/hand rather than the elbow. Brachioradialis originates from the lateral distal humerus and inserts on the radius, so it flexes the elbow but not at the ulna tuberosity.

The main idea is identifying the muscle whose origin and insertion match elbow flexion. The brachialis starts on the distal anterior surface of the humerus and inserts on the tuberosity of the ulna. When it contracts, it pulls the ulna toward the humerus, producing flexion at the elbow. This makes it the primary elbow flexor in this description.

The other muscles don’t fit the clue: flexor carpi radialis and palmaris longus arise from the medial epicondyle and mainly act on the wrist/hand rather than the elbow. Brachioradialis originates from the lateral distal humerus and inserts on the radius, so it flexes the elbow but not at the ulna tuberosity.