Corrugator Cutis Ani
Pelvic Floor
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A variable perianal skin muscle — creates the puckered appearance of the anus and retracts the perianal skin away from the anal canal.
Function
Wrinkles/retracts perianal skin
Origin
Subcutaneous tissue/fascia near anus
Insertion
Skin around anal verge
Innervation
Inferior rectal branches of pudendal nerve