A manual of practical obstetrics . s. There are no means by which we can measure with precision(say within one-fifth or even one-fourth of an inch) the diam-eters of the pelvis in a living female; our measurementsunder such circumstances can only approximate the are there any means by which we can measure anymore accurately the diameter of a childs head before it isborn ; we can scarcely do better than guess even its approxi-mate measurements. Hence there is no practical use in trying to define and teachthe measurements of the average female pelvis with that ex-treme precision (d
A manual of practical obstetrics . s. There are no means by which we can measure with precision(say within one-fifth or even one-fourth of an inch) the diam-eters of the pelvis in a living female; our measurementsunder such circumstances can only approximate the are there any means by which we can measure anymore accurately the diameter of a childs head before it isborn ; we can scarcely do better than guess even its approxi-mate measurements. Hence there is no practical use in trying to define and teachthe measurements of the average female pelvis with that ex-treme precision (down to the smaller fractions of an inch)attempted in many obstetric text-books. It complicates the 36 THE PELVIS. matter without any special advantage; an approximate pre-cision is all that is requisite—all that is possible. Diameters of the Superior Strait (see Fig. 1, page 26):First. The antero-posterior (sacro-pubic, conjugate ), ex-tending from the middle of the sacral promontory to the topof the symphysis pubis. • Fig. C. V., Conjugate diameter of superior strait. D. C, Diagonal S., Axis of plane of superior strait. P. 0., Flane of the outlet, orinferior strait, h. h., Line of the horizon. In this figure, the woman issupposed to be standing erect. Second. The transverse (bis-iliac), extending across the widestpart of the strait, from the centre of one lateral margin of thebrim to the other. Third. The right oblique, extending from the right sacro-iliac synchondrosis1 to the left acetabulum (or left ilio-pecti-neal eminence, which is nearly the same thing). 1 The oblique are sometimes called right and left, according to theacetabulum they touch, instead of from the sacro-iliac synchondrosis, as inthe text. LENGTH OF DIAMETERS OF PELVIC CANAL. 37 Fourth. The left oblique, extending from the left sacro-iliacsynchondrosis to the right acetabulum. Fifth. The diagonal conjugate, extending from the middleof the sacral promontory to the lower end of the pubic
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