The angle formed by the two arms of the pubic arch is larger in women (80°–85°) than it is in men (50°–60°).
The ischial spines generally do not project as far medially into the pelvic cavity in women as they do in men.
The true pelvis is cylindrical and has an inlet, a wall, and an outlet. The inlet is open, whereas the pelvic floor closes the outlet and separates the pelvic cavity, above, from the perineum, below.