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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. Absent anal reflex may signify; cauda equina syndrome, spinal cord lesion, or local operations. Sensation is conveyed by the pudendal nerve integrated by sacral segments S2-S4. To find out more about our work and the full range of our publications please visit our website: http://www.clinicalexams.co.uk/ The complete videos can be streamed or downloaded from our Vimeo site: https://vimeo.com/user21235595/vod_pages Excerpts and free video clips can be found on our YouTube channel: https://www.youtube.com/channel/UCyG7qeIHTBGlJqNrBi-_1NA/videos?view_as=publicu0026shelf_id=1u0026view=0u0026sort=dd Bloomsbury Educational Limited 97 Judd Street, London, WC1H 9JB http://www.clinicalexams.co.uk/ Please subscribe to our channel to benefit from new additions. DISCLAIMER Bloomsbury Educational will not be held responsible or liable for any kind of loss or injury incurred as a result of the information conveyed in our videos. All procedures must be practiced in a supervised professional clinical setting. Andreas Syrimis, Bloomsbury Educational Limited.