Subpubic angle. Angulus subpubicus. The angle between the right and left inferior ramus of the pubis (average of 75° in men and 90°-100° in women). C

Greater pelvis. Pelvis major. The space between the two alae of the ilium above the linea terminalis.

Lesser pelvis. Pelvis minor. The space below the linea terminalis.

Terminal line. Linea terminalis. Line extending along the arcuate line from the promontory to the upper margin of the symphysis. It marks the boundary between the greater pelvis and lesser pelvis as well as the plane of the pelvic inlet. C D E

Upper pelvic aperture (pelvic inlet). Apertura pelvis (pelvica) superior. Upper opening of the lesser pelvis in the plane of the linea terminalis. D

Lower pelvic aperture (pelvic outlet). Apertura pelvis (pelvica) inferior. Lower opening of the lesser pelvis between the coccyx, pubic arch and sacrotuberous ligaments. F Pelvic axis. Axis pelvis. Imaginary line passing through all median connecting lines between the symphysis and the anterior surface of the sacrum. The fetal head follows its course during birth. F

Conjugate diameter. Diameter conjugata. An-teroposterior diameter of the pelvis, measured from the sacral promontory to the posterior surface of the symphysis (about 11 cm). E F Transverse diameter of pelvis. Diameter transversa. Widest part of the inlet (ca. 13 cm). E Oblique diameter. Diameter obliqua. It is measured from the iliosacral joint obliquely forward to the iliopubic eminence of the opposite side (ca. 12.5 cm). E Pelvic inclination. Inclinatio pelvis. The angle between the plane of the pelvic inlet and the horizontal plane. F

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Essentials of Human Physiology

Essentials of Human Physiology

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