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Normal anus - Anogenital in
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Normal anus - Anogenital in

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Contributors: Mary Spencer MD, Ann Lenane MD, Sireesha Reddy MD, Amy Swerdlin MD, Manasi Kadam Ladrigan MD, Carol Berkowitz MD
Other Resources UpToDate PubMed

Synopsis

The anal canal is approximately 4 cm at its adult length. The upper part of the canal is formed from the hindgut, and the lower from the ectoderm. The anus is the external outlet of the GI tract. The internal anal sphincter is composed of a circular layer of smooth muscle, while the external anal sphincter is composed of the striated muscle of the pelvic floor. The internal sphincter tone is maximized when there is rectal distention.

Codes

ICD10CM:
 – Normal Condition -- no billing code

SNOMEDCT:
300321007 – Anus normal

Look For

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Diagnostic Pearls

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Differential Diagnosis & Pitfalls

There is no further differential diagnosis in the case of a normal anus.

Best Tests

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Management Pearls

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Therapy

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References

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Last Updated: 12/20/2009
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Normal anus - Anogenital in
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Normal anus
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