Schaeffers reflex, also known as the plantar reflex, refers to the involuntary reaction of the foot when stimulated. It is commonly used in neurological examinations to assess the integrity of the central nervous system. Synonyms for this term include Babinski reflex, big toe sign, and upgoing toe sign. These terms all describe the same phenomenon where the big toe flexes upward and the other toes fan out when the sole of the foot is stroked. Named after the French neurologist Joseph Babinski, who first described it in 1896, the Schaeffers reflex is an essential diagnostic tool for identifying certain neurological conditions, such as damage to the brain or spinal cord.