What is the reflex for S1 nerve root (L5-S1)?

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Multiple Choice

What is the reflex for S1 nerve root (L5-S1)?

Achilles (ankle-jerk) reflex is the test most closely associated with the S1 nerve root. Tapping the Achilles tendon stretches the gastrocnemius-soleus complex and triggers a monosynaptic reflex arc that travels through the tibial nerve to the spinal cord, predominantly engaging the S1 (with some contribution from S2) segments. The resulting response is plantarflexion of the foot. Clinically, a diminished or absent Achilles reflex points to S1 radiculopathy or dysfunction at the L5–S1 level, whereas other deep tendon reflexes map to different nerve roots (for example, the patellar reflex tests L4, and the biceps and triceps reflexes test cervical levels).

Achilles (ankle-jerk) reflex is the test most closely associated with the S1 nerve root. Tapping the Achilles tendon stretches the gastrocnemius-soleus complex and triggers a monosynaptic reflex arc that travels through the tibial nerve to the spinal cord, predominantly engaging the S1 (with some contribution from S2) segments. The resulting response is plantarflexion of the foot. Clinically, a diminished or absent Achilles reflex points to S1 radiculopathy or dysfunction at the L5–S1 level, whereas other deep tendon reflexes map to different nerve roots (for example, the patellar reflex tests L4, and the biceps and triceps reflexes test cervical levels).

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