Thenar atrophy suggests which condition?

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Study for the Parkinson’s Disease Exam. Engage with detailed flashcards and multiple-choice questions, each offering hints and explanations. Prepare effectively for your exam!

Multiple Choice

Thenar atrophy suggests which condition?

Explanation:
Thenar atrophy points to loss of the median nerve’s motor supply to the thumb muscles. The thenar eminence (abductor pollicis brevis, flexor pollicis brevis, opponens pollicis) is innervated by the recurrent branch of the median nerve. When the median nerve is compressed at the carpal tunnel, these muscles weaken and waste away, producing visible atrophy. This pattern is classic for carpal tunnel syndrome. Ulnar nerve issues affect different hand muscles (like those of the hypothenar eminence and interossei) and thoracic outlet syndrome gives a more variable distribution, so they don’t best explain isolated thenar atrophy.

Thenar atrophy points to loss of the median nerve’s motor supply to the thumb muscles. The thenar eminence (abductor pollicis brevis, flexor pollicis brevis, opponens pollicis) is innervated by the recurrent branch of the median nerve. When the median nerve is compressed at the carpal tunnel, these muscles weaken and waste away, producing visible atrophy. This pattern is classic for carpal tunnel syndrome. Ulnar nerve issues affect different hand muscles (like those of the hypothenar eminence and interossei) and thoracic outlet syndrome gives a more variable distribution, so they don’t best explain isolated thenar atrophy.

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