Which reflex is associated with S1 nerve root?

Prepare for the Neuromusculoskeletal II Lecture Exam with detailed study guides, flashcards, and multiple choice questions. Unlock comprehensive insights and enhance your knowledge for success.

Multiple Choice

Which reflex is associated with S1 nerve root?

Explanation:
The Achilles reflex is the one tied to the S1 nerve root. Tapping the Achilles tendon stretches the gastrocnemius-soleus complex and the reflex arc goes through the tibial nerve, mostly reflecting S1 (and to some extent S2) function. Clinically, a diminished or absent ankle jerk suggests S1 involvement. In contrast, the knee-jerk (patellar) reflex mainly tests L4 in the quadriceps, the elbow biceps reflex tests C5–C6, and the medial hamstring reflex is not a standard, reliable indicator for S1. So the Achilles response best localizes to the S1 root.

The Achilles reflex is the one tied to the S1 nerve root. Tapping the Achilles tendon stretches the gastrocnemius-soleus complex and the reflex arc goes through the tibial nerve, mostly reflecting S1 (and to some extent S2) function. Clinically, a diminished or absent ankle jerk suggests S1 involvement. In contrast, the knee-jerk (patellar) reflex mainly tests L4 in the quadriceps, the elbow biceps reflex tests C5–C6, and the medial hamstring reflex is not a standard, reliable indicator for S1. So the Achilles response best localizes to the S1 root.

More practice questions