Show pageOld revisionsBacklinksBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ====== ISCHIOANAL FOSSA ====== * ischioanal fossa * wedge shaped space on each side of anal canal below pelvic diaphragm * boundaries * base * formed by skin of perineum * apex * formed by line wheere two fascia meet * obturator fascia * inferior fascia of pelvic diaphragm * the line corresponds to origin of levator ani from pelvic wall * anteriorly * limited by posterior border of perineal membrane * posteriorly fossa reaches * lower border of gluteus maximus * sacrotuberous ligament * lateral wall * is vertical * formed by * obturator internus * medial surface of ischial tuberosity * medial wall * slopes downwards * formed by * levator ani with anal fascia in upper part * external anal spinchter * recess * anterior recess * extends forwards above perineal membrane * reaches almost upto posterior surface of body of pubis * posterior recess * smaller than anterior * extends deep to sacrotuberous ligament * horseshoe recess * connects 2 ischioanal fossa behind anal canal * spaces and canals of fossa * perianal space * perianal fascia * separates a shallow subcutaneous * perianal space * from deep ischioanal space * fat arranged in loculi tightly * so infections are painful * ischioanal space * large and deep * fat arranged in loculi loosely * by incomplete septa * less painful infection due to less tension of swelling * lunate fascia arches over * ischioanal fat * divides in to * suprategmental space above fascia * tegmental space below fascia * pudendal canal * fascial canal in lateral waal of ischioanal fossa * encloses * pudendal nerve * internal pudendal vessels * fascia is fused with lower part of obturator fascia laterally * above * fused with lunate fascia * medially * perianal fascia * below * falciform process of sacrotuberous ligament * contents of ischioanal fossa * ischioanal pad of fat * inferior rectal nerve and vessels * pudendal canal with its contents * posterior scrotal or posterior labial nerve and vessels * perineal branch of fourth sacral nerve * perforating cutaneous branches of nerves S2,S3 en/ischioanal_fossa.txt Last modified: 2023/06/16 10:44by 127.0.0.1