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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The pelvis with soft parts, bladder, rectum, uterus, and its appendages havingbeen removed (from a model in the University of Pennsylvania). the lower part of the parturient tract in labor and directing thepresenting part forward, outward, and upward under the pubicarch. The levator ani is by far the most important muscle in thepelvic floor. It is a strong, horseshoe-shaped band of muscle,consisting of two symmetrical halves slung back from the anteriorpelvic wall and surrounding the vagina and rectum. It is thechief factor in pushing the presenting part forward away from the THE ANATOMY OF THE PELVIS. *7 perineum and out through the vulvar orifice. It is thus the chiefconservator of the integrity of the pelvic floor in labor. Its injuryrobs the rectum and posterior vaginal wall of their strongest sup-port, allowing them to drop downward, outward, and forward inthe rectocele, with which the gynecologist has to deal in second-ary operations upon so-called lacerations of the perineum.
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Fig- 9-âThe pelvic canal encroached upon by the soft structures (Veit). The ligamentous structures of the pelvis of greatest interest tothe obstetrician are the obturator membranes and the sacrosciaticligaments, which close the pelvic walls, help to impart to thecanal its shape and direction, and, by their situation at either endof the oblique diameters, receive upon their yielding surfaces thegreatest pressure from the extremities of the long diameters ofthe fetal head,âan arrangement much more favorable for the child 28 PREGNANCY than would be the compression of the longest diameters of thehead between bony pelvic walls. The Connective Tissue of the Pelvis.âAn intimate knowledgeof the complex arrangement of the pelvic fascia is not essential

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