. The science and art of midwifery . t the siteusually occupied by the vagina. In fetal life, the female sacrum, owing to the small size of thevertebra, is narrower than in the male. Subsequently the more rapidgrowth of the alffi becomes the cause of the increased width which characterizes the sacrum of the female at maturity. The larger cir-cumference of the brim in the female is due partly to this difference * Duncan, Researches in Obstetrics. f \i7 in the width of the sacrum and partly to the greater length of thelinea Lnnominata. The Soft Parts of the Pelvis.—Prefatory to the history of th
. The science and art of midwifery . t the siteusually occupied by the vagina. In fetal life, the female sacrum, owing to the small size of thevertebra, is narrower than in the male. Subsequently the more rapidgrowth of the alffi becomes the cause of the increased width which characterizes the sacrum of the female at maturity. The larger cir-cumference of the brim in the female is due partly to this difference * Duncan, Researches in Obstetrics. f \i7 in the width of the sacrum and partly to the greater length of thelinea Lnnominata. The Soft Parts of the Pelvis.—Prefatory to the history of the im-pregnated ovum, we have already considered the more important pel-vic viscera concerned in generation and parturition. In studying themechanism of labor, it is, however, necessary in addition to recall—1. The soft tissues which encroach upon the pelvic space; %. The AORTA VENA CAVA PSOAS MUSCLE PRIMITIVE ILIACVEIN. EXTERNAL ILIAC VEINILIAC MUSCle. PRIMITIVE lUINC. tEXTERNAL\ ILIAC. INTERNAL ILIAC Fig. covered with the soft parts, with removal of bladder, uterus, and rectum. structures which close in the openings of the pelvis, and convert itinto a basin-like cavity. 1. The diameters of the brim are diminished somewhat by theilio-psose muscles. The iliac muscles proper occupy the entire surfaceof the internal iliac fossa?. The fibers converge below, and, passingbeneath Pouparts ligament, become united to the borders of the psoasmuscle. The pelvic portion affords a soft cushion for the support ofthe o-ravid uterus. The greal psoas muscles till out the spaces upon L58 LABOR. the sides of the promontory. They take their origin from the lateralsurfaces of the bodies and transverse processes of the four upper lum-bar ami the last dorsal vertebrae. They cross the pelvis parallel to thelinea innominata, which, however, they slightly overlap. They taperbelow, and, passing beneath the femoral arch, terminate in a tendon,which
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