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Anal triangle
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
* the two
sacrotuberous ligaments
Contents
Some
components
of the anal triangle include:
Ischioanal fossa
Anococcygeal body
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