- Anal wink
The anal wink, anal reflex, perineal reflex, or anocutaneous reflex is the
reflexive contraction of the external anal sphincterupon 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 perinealskin to the pudendal nerve, where a response is integrated by the spinal cord sacral segments S1-S3.
The absence of this reflex indicates that there is an interruption of the
reflex arc, which may be in the sensory afferentlimb or the motor efferentlimb. The synapsebetween the afferent and efferent limbs occurs in the lowest sacral segments of the spinal cord.
Child abuse controversy
Bruce Woodlingdeveloped the "anal wink test" which he alleged was an indisputable diagnostic indicator that a child had been sodomised. In a clinical setting, he would spread a child’s buttocks and touch the anus with a cotton swab. If the anus "winked", Woodling testified, this was "proof of sodomy". His testimony was prominent in the McMartin preschoolchild abuse case.
It has since been established that Woodling never made any effort to validate his test, and it has been utterly discredited.
pseudoscientifictestimony during the trial of Ray Buckeycontributed to Buckey spending five years in prison without bail. Buckey was later released without conviction.
Reflex anal dilatation
* [http://www.law.umkc.edu/faculty/projects/ftrials/mcmartin/woodlingtestimony.html Testimony by Dr. Bruce Woodling] — Expert testimony in McMartin Child Abuse Case.
* [http://www.pathguy.com/abuse.htm False allegations of child abuse] — Expert opinion on false allegations of child abuse, with mention of "anal wink" testimony.
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