Which pairing correctly identifies the musculocutaneous nerve with its typical root levels?

Which pairing correctly identifies the musculocutaneous nerve with its typical root levels?

• A. Musculocutaneous nerve C5-C7
• B. Axillary nerve C4-C6
• C. Median C5-C2
• D. Radial C6-T1

Answer: (A)

Musculocutaneous nerve fibers come from the ventral rami of C5, C6, and C7, merging in the lateral cord to supply the anterior arm muscles. This C5–C7 pattern fits the nerve’s role in flexing the elbow and forearm supination (via the biceps, brachialis, and coracobrachialis) and its continuation as the lateral cutaneous nerve of the forearm. That’s why linking the musculocutaneous nerve with C5-C7 is the correct pairing. The axillary nerve is mainly C5-C6, the median nerve runs from C5 to T1, and the radial nerve also carries roots from C5 to T1, so those options describe different nerves rather than the musculocutaneous.

Musculocutaneous nerve fibers come from the ventral rami of C5, C6, and C7, merging in the lateral cord to supply the anterior arm muscles. This C5–C7 pattern fits the nerve’s role in flexing the elbow and forearm supination (via the biceps, brachialis, and coracobrachialis) and its continuation as the lateral cutaneous nerve of the forearm. That’s why linking the musculocutaneous nerve with C5-C7 is the correct pairing. The axillary nerve is mainly C5-C6, the median nerve runs from C5 to T1, and the radial nerve also carries roots from C5 to T1, so those options describe different nerves rather than the musculocutaneous.