What part of the brachial plexus does the long thoracic nerve originate from?

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Question restatement: What part of the brachial plexus does the long thoracic nerve originate from? Answer options: Cords, Divisions, Roots, Trunks.

Option 1 — Cords: The cords are formed distal to the divisions and roots, giving rise to nerves such as the median, ulnar, and radial nerves. The long thoracic nerve does not arise from the cords, so this is not correct.

Option 2 — Divisions: Divisions separate the trunks into anterior and posterior divisions before giving off the named cords and branches. Since the long thoracic nerve does not originate at the division level, this option is inaccurate.

Option 3 — Roots: The long thoracic nerve originates from the roots of the brachial plexus, specifically C5 to C7. These root contributions travel laterally along the side of the thorax to reach the serratus anterior muscle. This option aligns with the known anatomical origin of the nerve.

Option 4 — Trunks: The trunks (upper, middle, lower) are proximal to the divisions and cords, but the long thoracic nerve is not derived from the trunks. It does not arise at this level, so this is incorrect.

Summary: The only option that matches the true anatomical origin of the long thoracic nerve is its emergence from the roots (C5–C7) of the brachial plexus. The incorrect options misplace the nerve’s origin within the proximal segmental organization (cords, divisions, trunks), which do not give rise to the long thoracic nerve.

ANATOMY 2300 AU2025 (34636) Unit 3 Exam- Requires Respondus LockDown Browser

What part of the brachial plexus does the long thoracic nerve originate from?

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