. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Ischium Obturator Foramen Pubis '—-Pubic Symphysis Fig. 544. Inner surface of the innominate bone of a child of eight years. (After Morris.) TABLE IX a to b c to d s cm 1 cm $ cm cm The large fan-shaped ilium of man articulates, at an ear-shaped auricu- lar surface, with the sacrum formed from five sacral vertebrae and their ribs. The two innominate bones, to- gether with the sacrum and coccyx, form the pelvis, a somewhat funnel- shaped
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Ischium Obturator Foramen Pubis '—-Pubic Symphysis Fig. 544. Inner surface of the innominate bone of a child of eight years. (After Morris.) TABLE IX a to b c to d s cm 1 cm $ cm cm The large fan-shaped ilium of man articulates, at an ear-shaped auricu- lar surface, with the sacrum formed from five sacral vertebrae and their ribs. The two innominate bones, to- gether with the sacrum and coccyx, form the pelvis, a somewhat funnel- shaped basin with a large anterior opening and a smaller posterior one. Through this bony halo must pass every mammal that is normally born into the world. In the female, the an- terior parts of the ilia have a greater spread than in the male, giving as a result not only a shallower pelvic basin but broader hips. There are also dis- tinguishable sexual differences in the posterior opening, which for obvious reasons is relatively larger in the female than in the male. Rauber gives the average comparative dimensions in man shown in Table IX, in which the letters refer to Figure 545. The human pelvic girdle is for many reasons perhaps the most character-. Fig. 545. Outline of the female pelvis a-b and c-d, two diameters of the in- ferior pelvic aperture. (After Cunning- ham.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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