Interscalene Spares C8-T1 — FRCA Primary MCQ

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ModerateAnatomyInterscalene Spares C8-T1FRCA Primary

Regarding the anatomy relevant to the interscalene block which nerve root is most commonly spared?

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Correct answer: E — T1

The interscalene block typically provides excellent coverage of C5-C7 (shoulder and upper arm) but frequently spares C8-T1 (ulnar nerve distribution). This is because the injection is made at the level of the roots/trunks and the lower trunk (C8-T1) lies furthest from the injection point. This makes the interscalene approach less suitable for forearm and hand surgery.

Reference: RCoA 2021 Primary FRCA Curriculum