Ischioanal fossa

Template:Short description Template:Template otherTemplate:Main other The ischioanal fossa (formerly called ischiorectal fossa) is the fat-filled wedge-shaped space located lateral to the anal canal and inferior to the pelvic diaphragm. It is somewhat prismatic in shape, with its base directed to the surface of the perineum and its apex at the line of meeting of the obturator and anal fasciae.

Boundaries

It has the following boundaries:

	ANTERIOR * fascia of Colles covering the transversus perinei superficialis * inferior fascia of the urogenital diaphragm (perineal membrane)
LATERAL * tuberosity of the ischium * Obturator internus muscle * obturator fascia	SUPERIOR: * Levator ani INFERIOR: * skin	MEDIAL: * Levator ani * Sphincter ani externus muscle * anal fascia
	POSTERIOR * Gluteus maximus * sacrotuberous ligament

Contents

The contents include:

• Inside Alcock's canal, on the lateral wall
  • internal pudendal artery
  • internal pudendal vein
  • pudendal nerve
• Outside Alcock's canal, crossing the space transversely
  • inferior rectal artery
  • inferior rectal veins
  • inferior anal nerves
  • fatty tissue across which numerous fibrous bands extend from side to side allows distension of the anal canal during defecation

See also

• Anal triangle

References

Public domain This article incorporates text in the public domain from Template:Wikidatathe 20th edition of Gray's Anatomy (1918) Template:Main other Template:Reflist

Additional images

• Coronal section of anterior part of pelvis, through the pubic arch. Seen from in front.
  Coronal section of anterior part of pelvis, through the pubic arch. Seen from in front.
• The superficial branches of the internal pudendal artery.
  The superficial branches of the internal pudendal artery.

External links

• Template:SUNYCrossSection
• Anatomy photo:41:04-0103 at the SUNY Downstate Medical Center - "The Female Perineum: The Ischioanal Fossa"
• Template:SUNYAnatomyImage
• Template:ViennaCrossSection
• perineum at The Anatomy Lesson by Wesley Norman (Georgetown University) (Template:NormanAnatomyFig, Template:NormanAnatomyFig)
• Diagram at Emory University