Root value of ankle jerk
The ankle jerk reflex, also known as the Achilles reflex, occurs when the Achilles tendon is tapped while the foot is dorsiflexed. This reflex is mediated by the S1 spinal segment of the spinal cord. Ref: guyton and hall textbook of medical physiology 12 edition page number: 774,775,776
L3 L4
L4 L5
S1 S2
S3 S4
Nervous system