nociceptive reflex

flex·or re·flex

flexion of ankle, knee, and hip when the foot is painfully stimulated; the crossed extension reflex occurs in association with it.

Synonym(s): defense reflex (1) , nociceptive reflex, withdrawal reflex

nociceptive reflex

n.

A reflex elicited by a painful stimulus.

nociceptive reflex

(1) A reaction of the autonomic nervous system to a perceived threat; alarm reaction. 
(2) Withdrawal reaction.

no·ci·cep·tive re·flex

(nō'si-sep'tiv rē'fleks)

A spinal reflex intended to protect the body from harm. It is an automatic (involuntary) neuromuscular action elicited by a defined painful stimulus.
Synonym(s): nociceptive withdrawal reflex.