anal triangle

{{Infobox anatomy

| Name = Anal triangle

| Latin = regio analis

| Greek =

| Image = 1116 Muscle of the Male Perineum.png

| Caption = Muscles of male perineum. (Anal triangle is roughly equal to bottom half of diagram.)

| Width =

| Image2 = 1116 Muscle of the Female Perineum.png

| Caption2 = Muscles of the female perineum. (Anal triangle is roughly equal to bottom half of diagram.)

| Precursor =

| System =

| Artery =

| Vein =

| Nerve =

| Lymph =

}}

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

Image:Gray320.png|Articulations of pelvis. Posterior view.

Image:Gray542.png|The superficial branches of the internal pudendal artery.

Image:Gray1077.png|The posterior aspect of the rectum exposed by removing the lower part of the sacrum and the coccyx.

{{SUNYAnatomyLabs|41|01|02|02}} - "The Female Perineum: Boundaries of the Female Perineum"
{{NormanAnatomy|perineum}} ({{NormanAnatomyFig|perineumboundaries}})