. On the theory and practice of midwifery . Plane of the Inferior Strait. — The plane of the inferior strait is usually re-garded as bounded by the inner lips of the two tuberosities of the ischial bones, therami of the ischia and pubis, the ischio-sacral ligaments, and the point of the this way we speak of the plane of the inferior strait as one plane only; whereas,there are, in fact, two such planes, an anterior and a posterior. This figure exhibits the contour of the outlet. The line c d represents the trans-verse diameter. The letters ceaed show the anterior semi-circumference, w
. On the theory and practice of midwifery . Plane of the Inferior Strait. — The plane of the inferior strait is usually re-garded as bounded by the inner lips of the two tuberosities of the ischial bones, therami of the ischia and pubis, the ischio-sacral ligaments, and the point of the this way we speak of the plane of the inferior strait as one plane only; whereas,there are, in fact, two such planes, an anterior and a posterior. This figure exhibits the contour of the outlet. The line c d represents the trans-verse diameter. The letters ceaed show the anterior semi-circumference, while cfbfd Fig. show the posterior semi-circumference of the outlet. Now from c d to a is an inclinedplane, and from c d to b is another inclined plane. These planes intersect each otherat an angle of 140°, and they ought to be distinguished as the anterior and as the pos-terior inclined planes of the perineal strait. In midwifery it will be found that as the child descends, in order to escape fromthe womb, it first impinges upon the posterior inclined plane, which it depresses first,and then begins to depress the posterior edge of the anterior inclined plane. When ithas succeeded in depressing the edges of the two planes, it escapes betwixt them,whereupon they resume their plnce like two valves, whose floating margins had beenfirst violently separated, and then allowed to close again.—Editor. MECHANISM OF PARTURITION. 199 ance with the axis of the brim, but rather more perpendicular: the uterinecontractions, however, remedy this by tilting the fundus uteri forwards,and so place the child in the r
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