A System of midwifery : including the diseases of pregnancy and the puerperal state . ied in some of the lower animals, it will be observedthat the sacro-sciatic notches are converted into foramina, great andsmall sacro-sciatic; 3 and 4. Through the former of pyri-form muscle, the great sciatic nerve, and the ischiatic vessels and nervespass, while the latter admits of the exit from the pelvis of the obturatorinternus muscle and the pubic vessels and nerve. The obstetrician may look upon these ligaments as discharging adouble function. They act, as has already been mentioned, by pre-
A System of midwifery : including the diseases of pregnancy and the puerperal state . ied in some of the lower animals, it will be observedthat the sacro-sciatic notches are converted into foramina, great andsmall sacro-sciatic; 3 and 4. Through the former of pyri-form muscle, the great sciatic nerve, and the ischiatic vessels and nervespass, while the latter admits of the exit from the pelvis of the obturatorinternus muscle and the pubic vessels and nerve. The obstetrician may look upon these ligaments as discharging adouble function. They act, as has already been mentioned, by pre-venting the displacement of the apex of the sacrum upwards and back-wards,—an accident which, without their aid. the verv oblique positionof that bone would in the erect posture be likely to engender: andtherefore, in this sense, they strengthen the sacro-iliac , in addition to this, they close in, in some measure, the largeirregular opening which constitutes the outlet of the pelvis : forming,at the same time, the framework of those soft structures which consti-. Internal surface of female pelvis, .showing—1, 2, greater and lesser sacro-sciatic liga-ments ; 3, 4, greater and lesser gaps or for-amina. II.] INCLINATION OF THE IELVI 41 fcute the floor of the pelvis—which exercise a very important influenceon the progress of labor, and which act also by affording an efficientand elastic support to organs which would otherwise be liable to fre-quent displacement downwards. In addition to the ligaments above described, there are others, some ofthem—as those of the hip-joint—of great importance : but as they haveno special obstetrical interest, their description may here well be omitted. Inclination of the Pelvis.—If we place the articulated pelvis on atable, so as to bring the tip of the coccyx ami the ischial tuberositiesinto the same horizontal plane, the brim of the pelvis will be found tolook upwards and slightly forwards. This was at one time .-up;
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectobstetrics, bookyear1
