EXTENSION REFLEX By N., Pam M.S. - April 7, 2013 The reflex action that extends a limb away from the body. Compare flexion reflex. EXTENSION REFLEX: "The extension reflex is a stretch reflex." Related Psychology Terms MASS REFLEX 1 BRACE PHANTOM LIMB PREHENSION EXTENSOR MUSCLE MIRROR CELL BAR REFLEX APICAL DENDRITE DELAYED REFLEX MILK LETDOWN REFLEX Cite this page: N., Pam M.S., "EXTENSION REFLEX," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/extension-reflex/ (accessed August 7, 2020).