Identifier: textbobstet00hirs (find matches)
Title: A textbook of obstetrics
Year: 1898 (1890s)
Authors: Hirst, Barton Cooke, 1861-1935
Subjects: Obstetrics
Publisher: Philadelphia : Saunders
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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y the sacrosciatic ligaments, which also sepa-rate them from the pelvic outlet. The pelvis of the female notonly differs from that of the male in accordance with the usualdifference in other parts of the skeleton, but also exhibits impor-tant modifications which relate to the sexual function. Thefemale pelvis is proportionately larger, but of more delicate con- THE ANATOMY OF THE PELVIS. 19 struction. It is proportionately, and often absolutely, of greaterbreadth, and is of less depth. The ilia spread more laterally, soas to produce greater breadth or prominence of the hips than inthe male. The true pelvis has greater horizontal capacity, lessdepth, and is commonly less curved and less contracted at theoutlet. The inlet is larger, less intruded upon by the sacralpromontory, and is more circular or transversely oval. Theoutlet is likewise larger, with the ischial tuberosities less conver-gent, and with the pubic arch wider, lower, more truly arched,and with the sides more everted. JUM.
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2.—The funnel-shaped false pelvis. In the female the sides of the pubic arch are narrower, moreflattened, and less ridged than in the male.1 The hip or innominate bones—in the adult a single piece—are composed, in fetal life and in childhood, of three separatebones,—the ilium, the ischium, and the pubis. The three bonesare united by a triradiate cartilage in the acetabulum, whichbegins to ossify at puberty, the ankylosis being complete in theeighteenth year. The descending ramus of the pubis and the 1 This brief anatomical description of the pelvis is taken, modified, from LeidysAnatomy. 20 PREGXAXCY. ramus of the ischium are also originally united by a cartilagewhich ossifies at about the eighth year. The Anatomy of the Pelvis Obstetrically Considered.—To the obstetrician the pelvis is a canal and not a basin, and is to bestudied mainly in its relation to the fetal body which mustpass through it. The false pelvis is of minor importance, actingsimply as a funnel-shaped struc

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