Perineum General features Region of below pelvic diaphragm(the levator ani and coccygeus muscles) anus

Boundaries A diamond-shape space whose boundaries are those of the pelvic outlet Lower border of symphysis pubis Rami of pubis and ischium Ischial tuberosities Sacrotuberous ligament The coccyx

Two triangles An imaginary line drawn between the two ischial tuberosities divides perineum into anterior and posterior triangles Urogenital triangle (anterior)－differs in male and female Anal triangle (posterior)－similar in both sexes

Urogenital triangle contains the roots of the external genital organ and the openings of the urogenital system. ischiopubic rami ischial tuberosity levator ani muscle

Anal triangle ischial tuberosity sacrotuberous ligament anus tip of the coccyx

Highlight Position and divisions of perineum.