BO VEISLAND / SCIENCE PHOTO LIBRARY BO VEISLAND / SCIENCE PHOTO LIBRARY
Female urogenital muscles from below, artwork. These muscles (red) maintain continence as part of the urinary and anal sphincters. At centre top is the clitoris, with the urethra, vagina and rectum below it. Surrounding them is the bulbospongiosus muscle, which closes the vagina. Inside of this muscle is the external anal sphincter, which controls the anal opening. At upper right is the urogenital diaphragm (red). At lower right is the levator ani (red), which supports the pelvic organs and surrounds the anus and vagina. Running across centre is the deep transverse perineal muscle, which also supports the pelvic organs. At bottom is the gluteus maximus, the largest buttock muscle.
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