Anal triangle

Dr Brian Gilcrease-Garcia ◉ and Assoc Prof Craig Hacking ◉ ◈ et al.

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.

References

Anatomy: Abdominopelvic

Anatomy: Abdominopelvic

skeleton of the abdomen and pelvis
muscles of the abdomen and pelvis
spaces of the abdomen and pelvis
- anterior abdominal wall
  - sternocostal triangle
- posterior abdominal wall
- abdominal cavity
  - peritoneum
  - retroperitoneum
- pelvic cavity
  - pelvic peritoneal space
    - rectouterine pouch (pouch of Douglas)
    - rectovesical pouch
  - retropubic space (of Retzius)
  - paravesical space
    - lateral fossa
    - supravesical fossa
  - presacral space
  - canal of Nuck
  - pudendal canal
  - obturator canal
- perineum
abdominal and pelvic viscera
blood supply of the abdomen and pelvis
lymphatics
- lymph node groups
- cisterna chyli
innervation of the abdomen and pelvis
- lumbar plexus
- sacral plexus

Article information

rID: 58892

System: Gastrointestinal, Urogenital

Section: Anatomy

Synonyms or Alternate Spellings:

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