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  2. Human anus - Wikipedia

    en.wikipedia.org/wiki/Human_anus

    Anatomy of the human anus. Frontal section. The anus is the final part of the gastrointestinal tract, and directly continues from the rectum, passing through the pelvic floor. The top and bottom of the anus are surrounded by the internal and external anal sphincters, two muscular rings which control defecation.

  3. Anal canal - Wikipedia

    en.wikipedia.org/wiki/Anal_canal

    The anal canal is the part that connects the rectum to the anus, located below the level of the pelvic diaphragm. [1] It is located within the anal triangle of the perineum, between the right and left ischioanal fossa. As the final functional segment of the bowel, it functions to regulate release of excrement by two muscular sphincter complexes ...

  4. File:Human anus.svg - Wikipedia

    en.wikipedia.org/wiki/File:Human_anus.svg

    English: Anatomy of the human anus, frontal section. Date: 17 February 2021: Source: Own work: Author: ... This W3C-invalid diagram was created with Inkscape ...

  5. External anal sphincter - Wikipedia

    en.wikipedia.org/wiki/External_anal_sphincter

    The external anal sphincter (or sphincter ani externus) is an oval tube of skeletal muscle fibers. [1] Distally, it is adherent to the skin surrounding the margin of the anus. [2] It exhibits a resting state of tonical contraction [1] and also contracts during the bulbospongiosus reflex. [3] [4] [5] [6]

  6. Internal anal sphincter - Wikipedia

    en.wikipedia.org/wiki/Internal_anal_sphincter

    The internal anal sphincter, IAS, or sphincter ani internus is a ring of smooth muscle that surrounds about 2.5–4.0 cm of the anal canal. It is about 5 mm thick, and is formed by an aggregation of the smooth (involuntary) circular muscle fibers of the rectum.

  7. Rectum - Wikipedia

    en.wikipedia.org/wiki/Rectum

    The human rectum is a part of the lower gastrointestinal tract. The rectum is a continuation of the sigmoid colon, and connects to the anus. The rectum follows the shape of the sacrum and ends in an expanded section called an ampulla where feces is stored before its release via the anal canal.

  8. Anal triangle - Wikipedia

    en.wikipedia.org/wiki/Anal_triangle

    (Anal triangle is roughly equal to bottom half of diagram.) ... The anal triangle is the posterior part of the ... Anatomy photo:41:01-0202 at the SUNY Downstate ...

  9. Anus - Wikipedia

    en.wikipedia.org/wiki/Anus

    In mammals, invertebrates and most fish, [1] [2] the anus (pl.: anuses or ani; from Latin, 'ring' or 'circle') is the external body orifice at the end of the rectum, i.e. the opposite end from the mouth. Its function is to facilitate the expulsion of wastes that remain after digestion.

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