Chaddock reflex

The Chaddock reflex is a diagnostic reflex similar to the Babinski reflex. Chaddock's sign is present when stroking of the lateral malleolus causes extension of the great toe, indicating damage to the corticospinal tract.^[1]

Chaddock reflex
Demonstration of the chaddock reflex in an early publication by Charles G. Chaddock
Differential diagnosis	corticospinal tract damage

It was identified by Charles Gilbert Chaddock in 1911.^[2]