A treatise on the science and practice of midwifery . it is not the axis of thebony pelvis alone that is of importance in obstetrics. We mustalways, in considering this subject, remember that the general axisof the parturient canal (Fig. 11) also includes that of the uterinecavity above, and of the soft parts below. These are variable indirection according to circumstances; and it is only the axis of thatportion of the parturient canal extending between the plane of thepelvic brim and a plane between the lower edge of the pubic sym-physis and the base of the coccyx that is fixed. The axis of t
A treatise on the science and practice of midwifery . it is not the axis of thebony pelvis alone that is of importance in obstetrics. We mustalways, in considering this subject, remember that the general axisof the parturient canal (Fig. 11) also includes that of the uterinecavity above, and of the soft parts below. These are variable indirection according to circumstances; and it is only the axis of thatportion of the parturient canal extending between the plane of thepelvic brim and a plane between the lower edge of the pubic sym-physis and the base of the coccyx that is fixed. The axis of thelower part of the canal will vary according to the amount of disten-sion of the perineum during labor; but when this is stretched toits utmost, just before the expulsion of the head, the axis of the plane 38 ORGANS CONCERNED IN PARTURITION. between the edge of the distended perineum and the lower border ofthe symphysis, looks nearly directly forwards. The axis of the ute-rine cavity generally corresponds with that of the pelvic brim, but Fig. [Representing General Axis of Parturient Canal, including the Uterine Cavity and Soft Parts. it may be much altered by abnormal positions of the uterus, such asanteversion from laxit}^ of the abdominal walls. The foetus, undersuch circumstances, will not enter the brim in its proper axis, anddifficulties in the labor arise. A knowledge of the general direction of the parturient canal is of greatFig. 12. importance in practical midwifery in guiding us to the introduction ofthe hand or instruments in obstetricoperations, and in showing us howto obviate difficulties arisino- fromsuch accidental deviations of theuterus as have been just alluded of the Pelvis. — The ar-rangements of the bones in the in-terior of the pelvic canal (Fig. 12)are important in relation to themechanism of delivery. A linepassing between the spine of theischium and the ilio-pectineal emi-nence divides the inner surface ofside view of Pelvis. ischial
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Keywords: ., bookcentury1800, bookdecade1870, bookidtre, booksubjectobstetrics
