Knee extension is mediated by which nerve roots via the Quadriceps?

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Multiple Choice

Knee extension is mediated by which nerve roots via the Quadriceps?

Explanation:
Knee extension is performed by the quadriceps muscles, and their motor innervation comes from the femoral nerve, which carries fibers from the lumbar nerve roots L2 through L4. Because the quadriceps are the primary knee extensors, those L2–L4 roots are the ones that mediate knee extension. Clinically, the patellar reflex (knee-jerk) largely reflects L4 activity within this pathway, helping localize function to these roots. Roots outside this range (such as C7–C8 or S2–S3) do not primarily control the quadriceps, so they don’t primarily govern knee extension.

Knee extension is performed by the quadriceps muscles, and their motor innervation comes from the femoral nerve, which carries fibers from the lumbar nerve roots L2 through L4. Because the quadriceps are the primary knee extensors, those L2–L4 roots are the ones that mediate knee extension. Clinically, the patellar reflex (knee-jerk) largely reflects L4 activity within this pathway, helping localize function to these roots. Roots outside this range (such as C7–C8 or S2–S3) do not primarily control the quadriceps, so they don’t primarily govern knee extension.

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