It is lined by peritoneum and at its base is the rectoprostatic fascia (Denonvillier's fascia). When a man is upright or supine, it is the lowest part of his peritoneal cavity.
It is surrounded by peritoneum, and at its base lies the rectoprostatic fascia (Denonvillier's fascia). When a man stands or lies down, it constitutes the lowest part of his peritoneal cavity.