A treatise on the science and practice of midwifery . asily the weight of thegravid uterus. The height of the promontory of the sacrum above theupper margin of the symphysis pubis is on an average about 3f inches,and a line passing horizontally backward from the latter point wouldimpinge on the junction of the second and third coccygeal bones. Axes of the Parturient Canal.—By the axis of the pelvis is meant animaginary line which indicates the direction which the foetus takesduring its expulsion. The axis of the brim (Fig. 10) is a line drawnperpendicular to its plane, which would extend from
A treatise on the science and practice of midwifery . asily the weight of thegravid uterus. The height of the promontory of the sacrum above theupper margin of the symphysis pubis is on an average about 3f inches,and a line passing horizontally backward from the latter point wouldimpinge on the junction of the second and third coccygeal bones. Axes of the Parturient Canal.—By the axis of the pelvis is meant animaginary line which indicates the direction which the foetus takesduring its expulsion. The axis of the brim (Fig. 10) is a line drawnperpendicular to its plane, which would extend from the umbilicus toabout the apex of the coccyx; the axis of the outlet of the bony pelvisintersects this, and extends from the centre of the promontory of thesacrum to midway between the tuberosities of the ischia. The axis ofthe entire pelvic canal is represented by the sum of the axes of an indef-inite number of planes at different levels of the pelvic cavity, whichforms an irregular parabolic line, as represented in the diagram (, A d). Fig. Representing General Axis of Parturient Canal, including the Uterine Cavity and Soft Parts. It must be borne in mind, however, that it is not the axis of the bonypelvis alone that is of importance in obstetrics. We must always, inconsidering this subject, remember that the general axis of the parturientcanal (Fig. 11) also includes that of the uterine cavity above and of thesoft parts below. These are variable in direction according to circum-stances; and it is only the axis of that portion of the parturient canalextending between the plane of the pelvic brini and a plane between the 46 ORGANS CONCERNED IN PARTURITION. lower edge of the pubic symphysis and the base of the coccyx that isfixed. The axis of the lower part of the canal will vary according tothe amount of distension of the perineum during labor; but when this isstretched to its utmost, just before the expulsion of the head, the axis ofthe plane between the edge of the d
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
