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 |
TA98 | A01.2.06.002 |
TA2 | 278 |
FMA | 20347 |
Anatomical terminology |
The anal triangle is the posterior part of the perineum. It contains the anus in mammals.
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
Contents
Some components of the anal triangle include:[1]
- Ischioanal fossa
- Anococcygeal body
- Sacrotuberous ligament
- Sacrospinous ligament
- Pudendal nerve
- Internal pudendal artery and internal pudendal vein
- Anal canal
- Muscles
Additional images
-
Articulations of pelvis. Posterior view.
-
The superficial branches of the internal pudendal artery.
See also
References
External links
- 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)