Abstract
The anatomy of the perianal region can be accurately demonstrated with magnetic resonance imaging (MRI). The anal canal begins at the level of the levator ani and extends until the anus, resulting in a typical length of 2.5-5 cm. It is surrounded by the internal and external anal sphincters. The puborectalis muscle forms the top of the anorectal ring and continues caudally in the joined longitudinal muscles and subsequently in the external anal sphincter muscle.
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Pompili, G.G., Munari, A., Rigamonti, P., Cornalba, G.P. (2013). MRI Anatomy of the Anorectal Region. In: Tonolini, M., Maconi, G. (eds) Imaging of Perianal Inflammatory Diseases. Springer, Milano. https://doi.org/10.1007/978-88-470-2847-0_2
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DOI: https://doi.org/10.1007/978-88-470-2847-0_2
Publisher Name: Springer, Milano
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