What area of sensation is lost with a median nerve injury?

A median nerve injury typically results in sensory loss over the areas innervated by the median nerve. The median nerve provides sensation primarily to the palmar aspect of the thumb, the index finger, the middle finger, and the radial aspect of the ring finger. This means that in the event of a median nerve injury, individuals would experience a loss of sensation in the area of the distal radial aspect of the index finger, making this answer correct.

The distal ulnar aspect of the little finger is innervated by the ulnar nerve, and therefore would not be affected by a median nerve injury. The lateral aspect of the forearm, while innervated by the musculocutaneous nerve for motor function, does not relate closely to the median nerve’s sensory distribution. The palmar aspect of the thumb is innervated by the median nerve, but the question specifically focuses on the distal radial aspect of the index finger, further confirming the specific loss of sensation in that area due to median nerve injury.