. On the theory and practice of midwifery . we allow half an inch forvariations, this will give us a pretty correct idea of the diameters of thebrim. The circumference varies from thirteen to fourteen and a half inches, tt-n a. Dr. Burns has added other measurements: —from the sacro-ihacsymphysis to the crest of the pubis on the same side is four inches and ahalf; from the top of the sacrum to that part of the brim which is directlyabove the foramen thyroideum, is three inches and a half; the line, ifdrawn to the acetabulum in place of the foramen, is a quarter of an inchshorter; a line drawn
. On the theory and practice of midwifery . we allow half an inch forvariations, this will give us a pretty correct idea of the diameters of thebrim. The circumference varies from thirteen to fourteen and a half inches, tt-n a. Dr. Burns has added other measurements: —from the sacro-ihacsymphysis to the crest of the pubis on the same side is four inches and ahalf; from the top of the sacrum to that part of the brim which is directlyabove the foramen thyroideum, is three inches and a half; the line, ifdrawn to the acetabulum in place of the foramen, is a quarter of an inchshorter; a line drawn across the fore part of the brim, from one aceta-bulum to the other, is nearly four inches and a quarter. 24. The Cavity of the Pelvis, whose fixed boundaries are thesacrum, the ischium, and the pubis, is of unequal depth. Posteriorly itmeasures five inches, or six if the coccyx be extended; from the brim tothe tuber ischii, three inches and three quarters; and the depth of thesymphysis pubis is from two to two and a half inches. Fig. 7. 25. The antero-posterior diameter, from the hollow of the sacrum tothe symphysis pubis, is about four inches and a half; the transverse, atright angles with the former, is about four inches and three quarters; andthe oblique about five inches: a variation of a quarter of an inch eitherway being allowed. There are other measurements of considerable importance, inasmuch asthe childs head passes obliquely through the cavity of the pelvis. Thus,from the sacro-iliac synchondrosis of one side to the tuber ischii of theother, is six inches ; and to the ramus of the ischium, five inches : fromthe anterior margin of the sacro-sciatic notch, to the opposite side, is sixinches, or six and a quarter; from the anterior margin of the descendingramus of the ischium, to the opposite side, at the same level, is four inchesand three quarters. 26. The bones which constitute the pelvic cavity are smooth on theirinner surface, and present a series of inclined pla
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