Anal triangle

Last revised by Assoc Prof Craig Hacking on 27 Oct 2021

The anal triangle forms the posterior half of the diamond-shaped perineum. The triangle's three corners are defined by the tip of the coccyx posteriorly and both ischial tuberosities anterolaterally. The anterior border is the transverse perineal muscles and the posterolateral borders are the sacrotuberous ligaments.

It contains the anal canal, anal sphincters, and ischioanal fossae with their corresponding vessels.

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Cases and figures

  • Figure 1: female anal triangle
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  • Figure 2: male anal triangle
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