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patellar reflex
(redirected from Knee-jerk reaction)

    Also found in: Wikipedia 0.06 sec.
patellar reflex
n.
A reflex contraction of the quadriceps muscle resulting in a sudden involuntary extension of the leg, produced by a sharp tap to the tendon below the patella. Also called knee jerk, knee-jerk reflex, knee reflex, quadriceps reflex.


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