Medical Definition of ankle jerk
: a reflex downward movement of the foot produced by a spasmodic contraction of the muscles of the calf in response to sudden extension of the leg or the striking of the Achilles tendon above the heel
— called also Achilles reflex
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“Ankle jerk.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/ankle%20jerk. Accessed 25 Feb. 2021.
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