The practice of obstetrics, designed for the use of students and practitioners of medicine . of a female pelvis.) directs it downward when impelled by contractions of the uterus, and thus aidsits engagement in the pelvic inlet; and not unless it be very much deformed willit obstruct the passage of the child. False Pelvis and External Measurements.—(See Pelvimetry, page 163.)The True Pelvis.—The true, inferior, or small pelvis is that part below theilio-pectineal line, and it forms the true obstetric pelvis (Fig. 509). The truepelvis in the female is much larger than that in the male. It is bou
The practice of obstetrics, designed for the use of students and practitioners of medicine . of a female pelvis.) directs it downward when impelled by contractions of the uterus, and thus aidsits engagement in the pelvic inlet; and not unless it be very much deformed willit obstruct the passage of the child. False Pelvis and External Measurements.—(See Pelvimetry, page 163.)The True Pelvis.—The true, inferior, or small pelvis is that part below theilio-pectineal line, and it forms the true obstetric pelvis (Fig. 509). The truepelvis in the female is much larger than that in the male. It is bounded poste-riorly by the concavity of the sacrum; on the sides by the sacro-sciatic liga-ments and the internal surfaces of the acetabula and obturator membranes ;anteriorly, by the pubic bones and obturator membranes. If any horizontalplane of this curved cylinder—the true pelvis—is taken at a level, the bonywall is incomplete. In any plane that may be selected there will be a foramencovered by membrane or by distensible and elastic muscular or fibrous tissue; PELVIC INLET. 381. or a movable joint such as the coccyx directly opposite the solid mass of thepubic bones; or some elastic tissue that will permit of considerable compressionwithout injury. The conclusion to be drawn from this fact is that althoughthe fetus must pass through this bony cylinder to reach the external world,yet by the peculiar formation of the pelvis both the fetus and the motherssoft parts are protected against too great or too prolonged pressure; while if con-cussions should occur, their effect would bemuch alleviated. The Pelvic Inlet.—The pelvic inlet, supe-rior strait, brim, margin, isthmus, linea ter-minale, linea ilio-pectinea, is the entrance tothe cavity of the true pelvis. The superiorstrait and the inferior strait received theirnames because they were thought to be morecontracted than the space which lies betweenthem. I prefer the term pelvic inlet. Theanatomical inlet is the entrance
Size: 1452px × 1720px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectobstetrics, bookyear1
