The brachial plexus emerges from:
A. Between the anterior and middle scalene muscles
B. Between the posterior and middle scalene muscles
C. Psoas major muscle
D. Psoas minor muscle
ANS: A
Rationale: The brachial plexus is formed by anterior rami of C5-T1. The plexus emerges between the anterior and middle scalene muscles, passes deep to the clavicle, and enters the axilla.
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