A nurse's handbook of obstetrics, for use in training-schools . orting the spinalcolumn, which carries the weight of the trunk, the head, andthe upper limbs. The flaring surfaces of the ilia make a sortof funnel to guide the fcetus into this basin, which, having nobottom, forms a bony canal through which the child has to passat the time of labor. The most constricted portion of the pelvis is called the brim,or inlet (Fig. 2), and is, naturally, of the greatest obstetric im-portance ; for, as a chain is only as strong as its weakest link,so is a canal only as broad as its narrowest part, and, e
A nurse's handbook of obstetrics, for use in training-schools . orting the spinalcolumn, which carries the weight of the trunk, the head, andthe upper limbs. The flaring surfaces of the ilia make a sortof funnel to guide the fcetus into this basin, which, having nobottom, forms a bony canal through which the child has to passat the time of labor. The most constricted portion of the pelvis is called the brim,or inlet (Fig. 2), and is, naturally, of the greatest obstetric im-portance ; for, as a chain is only as strong as its weakest link,so is a canal only as broad as its narrowest part, and, except incertain cases of deformity, any child that can pass safely throughthe brim can be delivered without any further difficulty. The brim of the pelvis is bounded behind by that portion ofthe upper anterior surface of the sacrum, which projects farthestforward and is called the (< promontory of the sacrum; on thesides by the lower borders of the ilia; and in front by the two 24 ma pubic bones, which meet in the median line and form thephysis pubis/ sym-. Fig. 2.—The pelvic inlet. (Garrigues.) A B, anteroposterior or true conjugate diame-ter; CD, left oblique diameter; E /% right oblique diameter; G H, transverse diameter;A S, sacrocotyloid distance; IK, crest of the ilium. The contour of the inlet is more or less heart-shaped becauseof the jutting forward of the promontory of the sacrum, and themost important diameter of the pelvis is the distance between thepromontory and the symphysis. If this is normal (ten centi-metres, or about four and one-quarter inches), it is almost cer-tain that the entire pelvis is normal, and that the child can beborn without any serious difficulty. The articulations (joints) of the pelvis, which possess ob-stetric importance, are four in number. Two are behind, betweenthe sacrum and the ilia on either side, and are termed the sacro-iliac synchondroses (plural of synchondrosis) ; one is in front,between the two pubic bones, and is called the
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Keywords: ., bookcentury1900, bookdecade1910, bookidnur, booksubjectobstetrics
