Anal triangle

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Anal triangle
Muscles of the female perineum. (Anal triangle is roughly equal to bottom half of diagram.)
Muscles of male perineum. (Anal triangle is roughly equal to bottom half of diagram.)
Latin	regio analis
Dorlands/Elsevier	r_07/12700160

The anal triangle is the posterior part of the perineum. It contains the anal canal.

Contents 1 Structure 2 Contents 3 Additional images 4 See also 5 External links

Structure

The anal triangle can be defined either by its vertices or its sides.

• Vertices
  • one vertex at the coccyx bone
  • the two ischial tuberosities of the pelvic bone
• Sides
  • perineal membrane (posterior)
  • the two sacrotuberous ligaments

Contents

Some components of the anal triangle include:

• Ischiorectal fossa
• Sacrotuberous ligament
• Sacrospinous ligament
• Pudendal nerve
• Internal pudendal artery and Internal pudendal vein
• Anal canal
• Muscles
  • Sphincter ani externus muscle
  • Gluteus maximus muscle
  • Obturator internus muscle
  • Levator ani muscle
  • Coccygeus muscle

Additional images

Articulations of pelvis. Posterior view.

The superficial branches of the internal pudendal artery.

The posterior aspect of the rectum exposed by removing the lower part of the sacrum and the coccyx.

See also

• Perineum
• Urogenital triangle

External links

• SUNY Labs 41:01-0202 - "The Female Perineum: Boundaries of the Female Perineum"
• Norman/Georgetown perineum (perineumboundaries)

ja:肛門三角

v • d • e General anatomy of torso
Thorax/ Thoracic cavity	Mediastinum (Superior, Anterior, Middle, Posterior) • Superior thoracic aperture • Inferior thoracic aperture • Triangle of auscultation • Intercostal space • Thoracic plane • Thoracic wall/Thoracic cage - fascia (Pectoral fascia, Clavipectoral fascia, Thoracolumbar fascia) • Chest • Midsternal line
Thoracic diaphragm	openings (Caval opening, Esophageal hiatus, Aortic hiatus, Foramina of Morgagni) • Central tendon • Crus of diaphragm • arcuate ligaments (Lateral, Medial, Median)
Abdomen/ Abdominal cavity	Retroperitoneum • Paracolic gutters • Hepatobiliary triangle anterior abdominal wall (Arcuate line, Linea alba, Tendinous intersection, Linea semilunaris, McBurney's point, Traube's space, Inguinal triangle) • Inguinal canal (Deep inguinal ring, Superficial inguinal ring, Intercrural fibers, Crura of superficial inguinal ring) • Lumbar triangle • regions (Epigastrium, Hypochondrium, Umbilical region, Latus, Hypogastrium, Inguinal region) • planes (Transpyloric plane, Intertubercular plane, Midclavicular line) fascia (Fascia of Camper, Fascia of Scarpa, Transversalis fascia, Renal fascia, Rectus sheath)
Pelvis/ Pelvic cavity	Pelvic floor • Retropubic space fascia (Pelvic fascia, Superior fascia of diaphragm of pelvis, Inferior fascia of diaphragm of pelvis, Fascia of the Obturator internus, Tendinous arch, Iliac fascia, Iliopectineal fascia)
Perineum	Anal triangle (Ischioanal fossa, Pudendal canal, Anococcygeal raphe) Urogenital triangle (Superficial perineal pouch, Deep perineal pouch) Perineal body fascia (Dartos/fascia of perineum/superficial perineal fascia/Fascia of Colles, Perineal membrane/"Inferior fascia of UGD", "Superior fascia of UGD")