Volume 1

A treatise on the science and practice of midwifery / by W.S. Playfair.

  • William Smoult Playfair
Date:
1898
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on the science and practice of midwifery / by W.S. Playfair. Source: Wellcome Collection.

    41/488 (page 13)
    Fig. 8. sacro-iliac joint being called the right oblique [diameter Biacjonalis Dextra, D. d], that from the left the left oblique [diameter Diagonalis Sinistra, D. s]) ; in the cavity a similar measurement is made at the same level as the conjugate; while at the outlet an oblique diameter is not usually mea- sured. The transverse (diameter Transversa, t) is taken at Trans- the brim, from a jDoint mid- way between the sacro-iliac joint and the ilio-pectineal eminence to a corresponding point at the opposite side of the brim ; in the cavity from points in the same plane as the conjugate and oblique diameters; and at the outlet from the centre of the inner border of one ischial tuberosity to that of the other. The measure- ments given by various writers differ considerably and vary somewhat in dif- ferent pelves. Taking the average of a large number, the following may be given as the standard measure- ments of the female pel- vis : Antero- Trans- IJosterior, Oblique, verse, C. V. 1). T. in. in. in. Brim . . 4-25 4-8 5-2 Cavity . . 4-7 5-2 4-75 Outlet . . 5-0 4-2 SBCTION or PKLVIS, SHOWINa TKK nrAMnrrEus. It will be observed that Differ- the lengths of the corre- o _ ^ ^ various spending diameters at dif- parts of ferent places vary greatly ; P^^'^^^- thus, while the transverse (t) is longest at the brim, the oblique (d) is longest in the cavity, and the antero-posterior (c. v) at the outlet. It will be subsequently seen that this fact is of great practical importance m studying the mechanism of