Anal wink reflex

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The anal wink, anal reflex, perineal reflex, or anocutaneous reflex is the reflexive contraction of the external anal sphincter upon stroking of the skin around the anus. A noxious or tactile stimulus will cause a wink contraction of the anal sphincter muscles and also flexion. The stimulus is detected by the nociceptors in the perineal skin to the pudendal nerve, where a response is integrated by the spinal cord sacral segments s2-s4. The stimulus is detected by the nociceptors in the perineal skin to the pudendal nerve, where a response is integrated by the spinal cord sacral segments s2-s4.   a reaction of the external anal sphincter muscle when the adjacent skin is briefly and briskly stimulated. A normal reflex is a contraction of the sphincter also known as anal wink. The anal reflex is elicited by a pinprick of the perianal skin, producing an anal wink. Electrophysiologic correlates of these reflexes have been described using electrical, mechanical, and magnetic stimulation. The bulbocavernosus reflex (bcr), bulbospongiosus reflex (bsr) or osinski reflex is a polysynaptic reflex that is useful in testing for spinal shock and gaining information about the state of spinal cord injuries (sci). Bulbocavernosus is an older term for bulbospongiosus, thus this reflex may also be referred to as the bulbospongiosus reflex. 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. The reflex exam is fundamental to the neurological exam and important to locating upper versus lower motor neuron lesions. There are five deep tendon reflexes and a number of superficial and visceral reflexes covered here.

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