Extensor Thrust Reflex

Published July 2, 2026 Read time 1 min read Readers 5

What is the “Extensor Thrust Reflex” used for?

The extensor thrust reflex is present at birth and normally up to 2 months of age.

When pressure is applied to the sole of the infant’s foot with the lower limb in a flexed position, the infant will suddenly extend the entire leg. This extension is sometimes followed by flexion.
This reflex can also be tested by holding the infant by the chest wall and axilla, and lowering the infant’s feet toward the top of the examining table. When the soles of the feet are pressed against the table, there is progressive extension of the legs from the feet proximally

Its absence may be due to flaccid paralysis.
Its presence beyond 2 months of age indicates neurologic dysfunction and developmental delay of the CNS.