Long Thoracic Serratus Anterior — FRCA Primary MCQ
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Correct answer: B — Serratus anterior
The long thoracic nerve (C5 C6 C7 — roots of the brachial plexus) innervates serratus anterior. Injury causes winging of the scapula (medial border protrudes posteriorly especially when pushing against a wall). It is vulnerable during axillary surgery / first rib resection / and chest drain insertion.
Reference: RCoA 2021 Primary FRCA Curriculum