Manual of gynecology . showsthe effect of this on the pelvic floor segments. The fluid pressure acts atright angles to the limiting surface which, in this case, is the pelvic peri-toneum. Thus, if the perpendiculars be counted, starting from the sym-physis, it can readily be seen that the first three will press the pubic seg- ANATOMY OF THE FEMALE PELVIC ORGANS. 17 ment against the symphysis ; that the fourth and fifth will do this also,but will further have a resultant tending to drive the pubic past the sacralsegment; that the sixth and seventh will, directly, tend to do this ; andthat the o
Manual of gynecology . showsthe effect of this on the pelvic floor segments. The fluid pressure acts atright angles to the limiting surface which, in this case, is the pelvic peri-toneum. Thus, if the perpendiculars be counted, starting from the sym-physis, it can readily be seen that the first three will press the pubic seg- ANATOMY OF THE FEMALE PELVIC ORGANS. 17 ment against the symphysis ; that the fourth and fifth will do this also,but will further have a resultant tending to drive the pubic past the sacralsegment; that the sixth and seventh will, directly, tend to do this ; andthat the others will drive it partly past the sacral segment, and partlyagainst it. From want of rigidity in the pubic segment, this drivingdown tendency is partly lost. Thus the effect of ordinary intra-abdominalpressure is to press the pubic against the sacral segment. Extra intra-abdominal pressure displaces downwards a definite portion of the pelvicfloor—viZi) all lying in front of the anterior rectal wall. There is in the. Fig. to illustrate effect of intra-abdominal pressure on the segments of the pelvic floor [Hart), a,uterus, pathologically ante-flexed; &, bladder; c, retropubic fat; d, labium majus; e, symphysis ; /, peri-neal body; g, rectum. pelvic floor a definite line of cleavage at which it yields, which line runsbetween the anterior rectal and posterior vaginal walls (see p. 63). This definite downward displacement causes the lesion known as pro-lapsus uteri. From this we see that the female pelvic floor is not equally strongthroughout. It would be, were the sacral segment prolonged and attachedto the symphysis pubis. But then parturition would have been an impos-sibility. It has been constructed not only quel intra-abdominal pressure,but also qud parturition. 78 MANUAL OF GYNECOLOGY. THE RESULTS BROUGHT ABOUT BY CHANGE OF POSTURE, ESPECIALLY BY THEGENU-PECTORAL POSTURE. The abdominal walls, along -with, the viscera bounded by them, areoften spoken of as the a
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