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

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

[edit] 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

[edit] 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

[edit] 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.

[edit] See also

• Perineum
• Urogenital triangle

[edit] External links

• SUNY Labs 41:01-0202 - "The Female Perineum: Boundaries of the Female Perineum"
• perineum at The Anatomy Lesson by Wesley Norman (Georgetown University) (perineumboundaries)

This anatomy article is a stub. You can help Wikipedia by expanding it. v • d • e

v • d • e List of muscles of perineum (TA A09.5, GA 4.425) Perineum Anal triangle sphincter ani (externus, internus) Ischioanal fossa · Pudendal canal Urogenital triangle superficial perineal pouch (superficial transverse perineal, bulbospongiosus, ischiocavernosus) deep perineal pouch (deep transverse perineal, sphincter urethrae membranaceae) Middle Perineal body Fascia superficial fascia: panniculus adiposus (Fascia of Camper) · stratum membranosum (Dartos, Superficial perineal fascia, Fascia of Colles) deep fascia: Fascia of perineum · Buck's fascia · Perineal membrane/"Inferior fascia of UGD" "Urogenital diaphragm" · "Superior fascia of UGD"

v • d • e Superficial axial anatomy and general regions (TA A01.2.01-06, GA 12.1287) Head Nasolabial fold Neck Triangles: Anterior of the neck (Muscular, Carotid, Submandibular, Submental) · Posterior of the neck (Occipital, Subclavian) · Suboccipital Supraclavicular fossa Thorax Triangle of auscultation · axillary folds (Anterior, Posterior) · Clavipectoral triangle · Inframammary fold Infraclavicular fossa Abdomen/pelvis regions (Epigastrium, Hypochondrium, Umbilical region, Latus, Hypogastrium, Inguinal region) quadrants (RUQ, LUQ, RLQ, LLQ) Lumbar triangle McBurney's point · Traube's space Perineal Anal triangle · Urogenital triangle