anal wink

A visible puckering at the margin of the external anal sphincter, evoked by stroking the perianal skin with a pin; absence of an anal wink reflex suggests a defect in either sensory or motor nerves or in the central pathways that mediate this reflex

anal wink

Contraction of the anal sphincter in response to pinprick stimulus of the perineum. This reflex is evidence of normal motor function at S4–S5. It is also known as the anal or anocutaneous reflex.