Anal triangle

Anal triangle
	Muscles of male perineum. (Anal triangle is roughly equal to bottom half of diagram.)
	Muscles of the female perineum. (Anal triangle is roughly equal to bottom half of diagram.)
Details
Identifiers
Latin	regio analis
TA	A01.2.06.002
FMA	20347
	Anatomical terminology

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

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 border of perineal membrane forms anterior border of anal triangle)
- the two sacrotuberous ligaments

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.

Daftary, Shirish; Chakravarti, Sudip (2011). Manual of Obstetrics, 3rd Edition. Elsevier. pp. 1-16. ISBN 9788131225561.

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

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