Which nerve extends down the little finger side of the arm into the palm?

Which nerve extends down the little finger side of the arm into the palm?

• A. Ulnar
• B. Radial
• C. Median
• D. Axillary

Answer: (A)

This question is about which nerve travels along the inner (ulnar) side of the forearm and into the palm. The ulnar nerve follows the ulna down the inner arm, passes behind the elbow near the medial epicondyle, and then continues into the hand through Guyon’s canal. In the hand it provides sensation to the little finger and the medial portion of the ring finger and supplies many intrinsic hand muscles. That path explains why this nerve reaches the palm on the little finger side. The other nerves don’t follow that route into the palm on the little finger side: the radial nerve stays on the lateral/posterior side of the arm and hand, the median nerve travels down the center toward the thumb side of the palm, and the axillary nerve stays up near the shoulder and does not extend into the hand.

This question is about which nerve travels along the inner (ulnar) side of the forearm and into the palm. The ulnar nerve follows the ulna down the inner arm, passes behind the elbow near the medial epicondyle, and then continues into the hand through Guyon’s canal. In the hand it provides sensation to the little finger and the medial portion of the ring finger and supplies many intrinsic hand muscles. That path explains why this nerve reaches the palm on the little finger side.

The other nerves don’t follow that route into the palm on the little finger side: the radial nerve stays on the lateral/posterior side of the arm and hand, the median nerve travels down the center toward the thumb side of the palm, and the axillary nerve stays up near the shoulder and does not extend into the hand.