The principles and practice of midwifery : with some of the diseases of women.

  • Milne, Alexander
Date:
1871
Catalogue details

Licence: Public Domain Mark

Credit: The principles and practice of midwifery : with some of the diseases of women. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

    43/680 (page 11)
    siinilai’ to those of the brim, but the diameters are re-\'ersed. Wliat is the short at the brim is the long at. the outlet. They are as follows :— Measurements of Outlet of True Pelvis. Antero-posterior (from point of cocc3'x to arch of pubi.s), fi in. Tran.sverse, between ischial tiibero.sities, 4 in. ObUque, between sacrosciatic ligament and ascending ramns of ischium, 5 in. The antero-jiosterior of the outlet may be increased a little owing to the flexibility of the coccyx. The out- let is not exactly a plane; it is two planes rather. 18. Axes of the Pelvis.—The axes of the pelvis are two, one of the brim, and one of the outlet. If, in tin* case of that of the brim, the imaginary line were extended, it would touch the umbilicus above, and the coccyx below. (See lig. 1.) That of the outlet i.s do-wnwards and forwards from the promontory of the sacrum to the centre of the space between the ischial tuberosities. The two lines ci’oss each other at a considerable angle. A knowledge of these axes is of much service to the accoiicheui-, for he is enabled thereby to place the patient in the most favouraltle position for delivery. In instrumental cases, too, delivery may l)e facilitated by keepmg them in mind, just as failure, and probably damage to the patient may result from neglecting them. 19. Planes of the Pelvis.—The planes of the pelvis deserve notice, seeing that they have an important influence during the descent of the foetus. “ They are imaginary levels stretching between certain correspond- ing points of the pelvis.” Three planes deservm atten- tion, viz., the plane of the inlet, or sujierior plane; the inferior, or that of the outlet; and a third, termed )jy Tyler Smith, the mid-plane. The plane of the inlet, which is bounded by the linea ilio-pectinea, i.s inclined to the horizon at an angle of about GO degrees m the female, according to Naegele ; that is, in the uniinjireg- uated condition. Tlie mid-]>hine has an inclination to