Anal triangle

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.)
Details
Latin	regio analis
*Anatomical terminology* [edit on Wikidata]

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

Some components of the anal triangle include:^[1]

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)

sphincter ani	external internal

Ischioanal fossa Pudendal canal

Middle

superficial perineal pouch	superficial transverse perineal bulbospongiosus ischiocavernosus

deep perineal pouch	deep transverse perineal sphincter urethrae membranaceae

Superficial perineal fascia	Colles' fascia (in scrotum and penis: Dartos)

Deep perineal fascia	Deep perineal fascia / superficial investing fascia (Gallaudet's) (in penis: Deep fascia of the penis (Buck's))

Urogenital diaphragm	Inferior fascia (Perineal membrane) Superior fascia

Pelvic diaphragm	Inferior fascia Superior fascia

Surface axial anatomy and general regions

Triangles:	Anterior Muscular Carotid Submandibular Submental Posterior Occipital Subclavian Suboccipital

Supraclavicular fossa

Triangle of auscultation Axillary folds Anterior Posterior Clavipectoral triangle Inframammary fold

Infraclavicular fossa

regions	Epigastrium Hypochondrium Umbilical region Flank Hypogastrium Inguinal region

quadrants	RUQ LUQ RLQ LLQ

Lap Lumbar triangle McBurney's point Desjardins' point Traube's space

General anatomy: systems and organs, regional anatomy, planes and lines, superficial axial anatomy, superficial anatomy of limbs

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