A treatise on the science and practice of midwifery . eme an extent, that the power of progression is materiallyinterfered with for a considerable time after delivery. Pelvis as a Whole.—On looking at a pelvis as a Avhole, we are atonce struck with its division into the true and false pelvis. Thelatter portion (all that is above the brim of the pelvis) is of compara-tively little obstetric importance, except in giving attachments tothe accessory muscles of parturition, and need not be further con-sidered. The brim of the pelvis is a heart-shaped opening, boundedby the sacrum behind, the linea
A treatise on the science and practice of midwifery . eme an extent, that the power of progression is materiallyinterfered with for a considerable time after delivery. Pelvis as a Whole.—On looking at a pelvis as a Avhole, we are atonce struck with its division into the true and false pelvis. Thelatter portion (all that is above the brim of the pelvis) is of compara-tively little obstetric importance, except in giving attachments tothe accessory muscles of parturition, and need not be further con-sidered. The brim of the pelvis is a heart-shaped opening, boundedby the sacrum behind, the linea ilio-pectinea on either side, and the 1 Researches in Obstetrics, p. 19. 32 ORGANS CONCERNED IN PARTURITION. symphysis of the pubes in front. All below it forms the cavity,which is bounded by the hollow of the , by the innersurfaces of the innominate bones at the sides and in front, and by theposterior surface of the symplrysis pubis. It is in this part of thepelvis that the changes in direction which the foetal head undergoes Fig. Outlet of Pelvis. in labor are imparted to it. The lower border of this canal, orpelvic outlet (Fig. 4), is lozenge-shaped, is bounded by the ischiatictuberosities on either side, the tip of the coccyx behind, and theunder surface of the pubic symphysis in front. Posteriorly to thetuberosities of the ischia the boundaries of the outlet are completedby the sacro-sciatic ligaments. Differences in the two Sexes.—There is a very marked differencebetween the pelvis in the male and the female, and the peculiaritiesof the latter all tend to facilitate the process of parturition. In thefemale pelvis (Fig. 5) all the bones are lighter in structure, and have Fig. 5.
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Keywords: ., bookcentury1800, bookdecade1870, bookidtre, booksubjectobstetrics
