Museo Galileo
Virtual Museum

Basin-shaped cavity forming the lower region of the trunk and enclosed by the pelvic girdle. Its lower boundary is the pelvic floor, a plane consisting of three bands of muscles and tendons separating the pelvis from the perineum underneath. The osseous diameters of the superior and inferior apertures of the small pelvis are referred to as pelvimetry and determine the progression of the fetus in the birth canal.