The principles of midwifery; including the diseases of women and children / [John Burns].

  • John Burns
Date:
1817
Catalogue details

Licence: Public Domain Mark

Credit: The principles of midwifery; including the diseases of women and children / [John Burns]. Source: Wellcome Collection.

    41/676 page 19
    ie shorter; a line drawn across the fore part of the brim, from one acetabulum to another, is nearly four inches and a quar- ter. The outlet of the pelvis is not so regular as the brim, in its shape, even when the soft parts remain; but it is some- what oval. The long diameter extends from the symphy- Sis pubis to the coccyx, and measures, when that bone is pushed back, as in labour, five inches, but an inch less when itis not. The transverse diameter, from the one tuberosity of the ischium to the other, measures four inches. ‘The out- let of the pelvis differs materially from the brim, in this re- spect, that its margins are not all on the same level; an oval wire will represent the brim, but, if applied to the outlet, it must be curved. The outlet, from the symphysis pubis to the tuberosity of the ischium, is semi-oval ; but behind, it be- comes more irregular, and bends upwards and backwards. The arch of the pubis, or the fore part of the outlet, is four inches broad at its base; and a perpendicular line, dropped from its centre to the bone, is fully two inches long. The top of the arch will permit a circular body to come in con- tact with it, whose diameter is an inch and a quarter. The length of each limb of the arch is three inches and a quar- ter. SECTION SECOND. The cavity of the pelvis is the next part to be attended to; and the most important observation to be made, is, that it is of unequal depth. At the back part, it measures from five to six inches, according as the coccyx is more or less ex- tended; at the side, a line drawn from the brim, to the tu- berosity -of the ischium, measures three inches and three- fourths, At the fore part, the depth of the symphysis pubis is an inch and a half. When the surface of the child’s head, then, is parallel to the lower edge of the symphysis, the head is still far from having entered fully into the cavity of the pelvis; it cannot be considered in the cavity, until it be lodged fairly in the hollow of the sacrum. .
    digitised image 1
    digitised image 2
    digitised image 3