Fysische diagnostiek - de voetzoolreflex

- On stimulation of the plantar surface an extensor response of the toes (especially the big toe; Babinski sign) indicates a disorder of the corticospinal system: disinhibition of reflex activity causes the big toe to be recruited into the synergistic flexion reflex of the leg (toe extensors are flexors in a physiological sense).

- Proper assessment of the plantar reflex therefore involves not only rating toe movements, but also observing simultaneous contraction of flexor muscles in the thigh.

- Disregard of the association with the flexion synergy has given rise to some misunderstandings.