. What is the most functionally important branch of the cervical plexus?
A. Branch to the sternocleidomastoid muscle
B. Branch to the biceps brachii
C. Branch to the triceps
D. Phrenic nerve
E. Musculocutaneous nerve
ANS: D
Rationale: The phrenic nerve is the most importand branch of the cervical plexus because it innervates the diaphragm.
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