Question:medium
Pen Test is for which nerve
Pen Test is for which nerve
Updated On: Jun 23, 2026
- Median Nerve
- Ulnar nerve
- PIN
- Musculocutaneous
Show Solution
The Correct Option is A
Solution and Explanation
The Pen Test is a clinical examination used to evaluate the $\text{Median Nerve}$.
Key reasoning:
The median nerve innervates muscles of the hand that are tested in the Pen Test -- specifically the thenar muscles (abductor pollicis brevis, opponens pollicis, flexor pollicis brevis) and the lateral two lumbricals.
How the test works: A small needle electrode is inserted into hand and arm muscles receiving impulses from the median nerve. Electric impulses are sent into the muscle, and the patient flexes the hand repeatedly. If the nerve is damaged or compressed, abnormal electrical activity is recorded.
Eliminating other options:
- Ulnar nerve: tested by Froment's sign, card test
- PIN (branch of radial nerve): tested by wrist/finger extension
- Musculocutaneous nerve: tested by elbow flexion and lateral forearm sensation
\[\boxed{\text{Median Nerve}}\]
Key reasoning:
The median nerve innervates muscles of the hand that are tested in the Pen Test -- specifically the thenar muscles (abductor pollicis brevis, opponens pollicis, flexor pollicis brevis) and the lateral two lumbricals.
How the test works: A small needle electrode is inserted into hand and arm muscles receiving impulses from the median nerve. Electric impulses are sent into the muscle, and the patient flexes the hand repeatedly. If the nerve is damaged or compressed, abnormal electrical activity is recorded.
Eliminating other options:
- Ulnar nerve: tested by Froment's sign, card test
- PIN (branch of radial nerve): tested by wrist/finger extension
- Musculocutaneous nerve: tested by elbow flexion and lateral forearm sensation
\[\boxed{\text{Median Nerve}}\]
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