. On the theory and practice of midwifery . ect is erect, this line is exactly per-pendicular. 21. The Lower or True Pelvis is the part involved in parturition, andwhich it is therefore essential to know with minute accuracy. For thepurpose of description, it is divided into the brim, cavity, and outlet. 22. The Brim of the Pelvis is defined by the linea ilio-pectinea; itis of an oval form, except posteriorly, where it is broken by the promon-tory of the sacrum. Its influence upon labour will be understood, whenwe recollect that it is the first solid resistance the head of the foetus meets;tha
. On the theory and practice of midwifery . ect is erect, this line is exactly per-pendicular. 21. The Lower or True Pelvis is the part involved in parturition, andwhich it is therefore essential to know with minute accuracy. For thepurpose of description, it is divided into the brim, cavity, and outlet. 22. The Brim of the Pelvis is defined by the linea ilio-pectinea; itis of an oval form, except posteriorly, where it is broken by the promon-tory of the sacrum. Its influence upon labour will be understood, whenwe recollect that it is the first solid resistance the head of the foetus meets;that any diminution in its size is more hazardous and less remediable thanin any other portion of the passages; and, lastly, that deviations fromthe normal proportions of the brim, most frequently entail similar ones inthe cavity. The three principal diameters are the antero-posterior (), from theprominence of the sacrum to the inner and upper edge of the symphysispubis; the transverse (2), across the widest part of the brim, at right Fig. angles to the antero-posterior; and the oblique diameter (3), from the sacro-iliac synchondrosis of one side, to the opposite side of the brim,, just abovethe acetabulum. 23. The measurements of their diameters are not exactly the same indifferent women, though the variation is but slight. I shall place themeasurements given by some of the chief authorities before the reader. 1 Antero-pos-teriordiamr. Transverse Oblique Denman. Burns. Ramsbo-tham. Rigby. Baude-locque. Velpeau. Moreau. 4 in. & afraction. 5 4 in. 4 in. H 5 43 in. 5-4 4-8 4 in. 5 4i 4 in. 5 41 4 in. 5 4i If we take the smallest of these estimates, there will still be space 44 OF THE PELVIS. enough to admit the head of the child; and if 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-ihac
Size: 1926px × 1298px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, booksubjectmidwifery, booksubjectpregnancy
