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Anal wink
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{{Short description|Contraction of the external anal sphincter}} The '''anal wink''', '''anal reflex''', '''perineal reflex''', or '''anocutaneous reflex''' is the [[reflex]]ive contraction of the [[external anal sphincter]] upon stroking of the skin around the anus.<ref name=Stanford>{{cite web|title=Deep tendon reflexes|url=http://stanfordmedicine25.stanford.edu/the25/tendon.html|accessdate=5 October 2015}}</ref> A noxious or tactile stimulus will cause a wink contraction of the [[Anus|anal]] [[sphincter muscle]]s and also flexion. The stimulus is detected by the [[nociceptor]]s in the [[Perineum|perineal]] skin to the [[pudendal nerve]], where a response is integrated by the [[spinal cord]] [[sacral segment]]s S2-S4. The absence of this reflex indicates that there is an interruption of the [[reflex arc]], or damage to the spinal cord,<ref>{{cite web|title=Reflex evaluation|url=https://www.dartmouth.edu/~dons/part_1/chapter_8.html|accessdate=5 October 2015|archive-date=25 September 2020|archive-url=https://web.archive.org/web/20200925004116/http://www.dartmouth.edu/~dons/part_1/chapter_8.html|url-status=dead}}</ref> which may be in the sensory [[afferent limb]] or the motor [[efferent limb]]. The [[synapse]] between the afferent and efferent limbs occurs in the lowest sacral segments of the [[spinal cord]]. ==See also== *[[Reflex anal dilation]] ==References== {{reflist}} [[Category:Reflexes]] [[Category:Anus]]
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