. The science and art of midwifery. INTERNALOBTURATORLARGE SAC RC-SCIATIC LIG. Fig. 105.—Section of pelvis, showing the internal obturator muscle. (Tarnier et Chantreuil.) The outlet of the pelvis is closed by a succession of layers, whichtogether constitute the perineal or pelvic floor. These layers, passingfrom without inward, consist respectively of the external cutaneoustissue, the muscular layers with their associated aponeuroses, the sub-peritoneal cellular tissue, and the peritonaeum. COCCYGEUS LEVATOR AN I?. OBTURATORINT. SECTION OF RECTUM SECTION OF VAGINASECTION OF BLADDER 3 Fig. 106
. The science and art of midwifery. INTERNALOBTURATORLARGE SAC RC-SCIATIC LIG. Fig. 105.—Section of pelvis, showing the internal obturator muscle. (Tarnier et Chantreuil.) The outlet of the pelvis is closed by a succession of layers, whichtogether constitute the perineal or pelvic floor. These layers, passingfrom without inward, consist respectively of the external cutaneoustissue, the muscular layers with their associated aponeuroses, the sub-peritoneal cellular tissue, and the peritonaeum. COCCYGEUS LEVATOR AN I?. OBTURATORINT. SECTION OF RECTUM SECTION OF VAGINASECTION OF BLADDER 3 Fig. 106.—Muscles of the perineal floor, as seen from the abdominal cavity. The pyramidal muscle has been removed. The most important structure which enters into the formation ofthe perineal floor is the levator-ani muscle. This muscle is composed MECHANISM OF LABOR. 167 of two symmetrical halves, attached in front to the inner surface of thebody and horizontal rami of the pubes, and laterally to the tendinousarch of the pelvic fascia which stretches from the inner border of thepubes to the spines of the ischia. Its fibers slope anteriorly down-ward and inward to the sides of the bladder, between and to the sidesof the bladder and rectum, and posteriorly are inserted into a tendinousraphe, extending from the extremity of the coccyx to the rectal insertions become confounded with the upper fibers of theexternal sphincter ; those of the vagina are situated beneath the bulbsof the vestibule and the constri
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Keywords: ., bookcentury1800, bookdecade1890, bookidsci, booksubjectobstetrics
