The first reflex to return after recovery from spinal shock is

Recovery of reflex excitability is due to the development of denervation hypersensitivity to the mediators released by the remaining spinal excitatory endings and the growing of collaterals from existing neurons with the formation of additional excitatory ending on interneurons and motor neurons. Flexor reflexes return first, and to elicit flexor reflex painful stimuli is required. The first reflex which usually appears is Babinski's reflex (i.e. Babinski's sign is positive). Ref: guyton and hall textbook of medical physiology 12 edition page number:774,775,776