Patellar reflex corresponds to which nerve roots?

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Multiple Choice

Patellar reflex corresponds to which nerve roots?

Explanation:
Patellar reflex is a stretch reflex of the quadriceps mediated by the femoral nerve. When the patellar tendon is tapped, the quadriceps muscle is stretched, and the muscle spindle sends an afferent signal into the spinal cord via the femoral nerve, entering at the L2–L4 levels. The signal then travels to the motor neurons that travel back through the femoral nerve to the quadriceps, causing a rapid contraction and knee extension. So, the reflex tests the integrity of the L2–L4 spinal segments. The other options involve reflexes in other regions (for example, C5–6 is associated with the biceps and brachioradialis reflexes in the arm; S1–2 with the Achilles reflex), which is why they don’t fit for the knee-jerk reflex.

Patellar reflex is a stretch reflex of the quadriceps mediated by the femoral nerve. When the patellar tendon is tapped, the quadriceps muscle is stretched, and the muscle spindle sends an afferent signal into the spinal cord via the femoral nerve, entering at the L2–L4 levels. The signal then travels to the motor neurons that travel back through the femoral nerve to the quadriceps, causing a rapid contraction and knee extension. So, the reflex tests the integrity of the L2–L4 spinal segments. The other options involve reflexes in other regions (for example, C5–6 is associated with the biceps and brachioradialis reflexes in the arm; S1–2 with the Achilles reflex), which is why they don’t fit for the knee-jerk reflex.

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