In carpal tunnel syndrome, which area is typically spared of sensory loss?

• A. Palmar side
• B. Thenar eminence
• C. Hypothenar eminence
• D. Dorsal mid-hand

Answer: (B)

In carpal tunnel syndrome, the thenar eminence is typically spared of sensory loss because this area is innervated by the recurrent branch of the median nerve, which often remains unaffected in early stages of the condition. Carpal tunnel syndrome primarily impacts the median nerve's ability to transmit sensory signals from the palmar side of the thumb, index finger, middle finger, and half of the ring finger, leading to numbness and tingling sensations in these areas.

The thenar eminence, being closely associated with the motor function of the median nerve, may still retain its sensory function even when other areas experience deficits. Therefore, individuals may present with weakness or atrophy in the thenar muscles, but sensory loss in this region is typically not observed, particularly during the initial stages of the syndrome.

In contrast, the palmar side, hypothenar eminence, and dorsal mid-hand are more likely to exhibit sensory changes due to their respective nerve innervations, highlighting the unique distribution and preservation of function seen in carpal tunnel syndrome.