Human anatomy, including structure and development and practical considerations . The Ischio-Rectal Fossa.—This space is a deep, roughly pyramidal hollow,filled chiefsV with fat, on either side of the rectum. The base is at the skin betweenthe tuberosity of the ischium and the anus, bounded in front by the line of reflectionof the deep perineal fascia and behind by the great sacro-sciatic ligament and theedge of the gluteus The base measures some 5 cm. ( 2 in. ) from beforebackward and half as much crosswise. The fossa is bounded externally by the tuber-osity of the ischium and above
Human anatomy, including structure and development and practical considerations . The Ischio-Rectal Fossa.—This space is a deep, roughly pyramidal hollow,filled chiefsV with fat, on either side of the rectum. The base is at the skin betweenthe tuberosity of the ischium and the anus, bounded in front by the line of reflectionof the deep perineal fascia and behind by the great sacro-sciatic ligament and theedge of the gluteus The base measures some 5 cm. ( 2 in. ) from beforebackward and half as much crosswise. The fossa is bounded externally by the tuber-osity of the ischium and above the latter by the obturator fascia, internally by theexternal sphincter and the under surface of the levator ani. The space narrowsabove to a line at the splitting of the pelvic fascia ; hence it can only vaguely becalled pyramidal. The depth of the fossa is about 5 cm. (2 in. j. Fig. 1426. Venous plexus Anterior wall of bladder Pelvic fascia i Prostate gland I Superior pubic ramus >•-&—?.?^T;7MSii^—Obturator*? ^ -^•*^^. ? membrane Diaphragmaticfascia. Obturator internus Obturator fasciaLevator ani Gluteus maximusIschio-rectal fossa Obturator externus Tuberosity ofischium Rectum Internal sphincterOblique transverse section ihrouKh pelvis in plane shown in small o\itliiie fij^ure. The diaphragmatic fascia, the inward continuation of the pelvic fascia whichcovers the upper surface of the levator ani, reaches the side of the rectum as a bedof areolar tissue beneath the peritoneum, and is more or less closely attached to thegut, sometimes by muscular bands, as already stated. The systematic descrijjtionof this fascia is given elsewhere (page 559). The rectal fascia is a dense layer of areolar tissue surrounding the rectumbelow the reflection of the peritoneum, being continuous below with the precedingfascia. It is particularly dense behind the rectum, which it separates from thesacrum and coccvx. The anal fascia is a web-like areolar sheet covering the under side of t
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