Spinal Reflexes and their roots

Patellar tendon reflex physiology

Deep tendon reflexes roots

  • Ankle jerk: S1, S_{2}
  • Knee jerk: L_{3} L_{4}
  • Biceps jerk: C_{5} , C_{6}
  • Triceps jerk: C_{7} C_{8}
  • Radial jerk: C_{6}
  • Jaw jerk: Pons

Superficial reflexes roots

  • Plantar reflex: S_{1} S_{2}
  • Abdominal reflex: Gamma_{7} – T_{11}
  • Cremasteric reflex: L_{1}

Model Question 

24. Inverse supinator jerk is:
a. C5, C6
с. 15,51
b. C6,C7
d. L4, S1
Ans: ‘a’ c5, c6

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