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.

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    ligamentous fibres, which peeypabats greatly to the strength: of the parts. SECTION SECOND. The ossa innominata are joined to the sacrum by means of a thin layer of cartilaginous substance, which covers each bone; that belonging to the sacrum is the thickest: both are rough, and. betwixt them is found a soft yellowish sub- stance in small quantity. The connexion of the two bones, therefore, so far as it depends on this medium, cannot be very strong; but it is exceedingly strengthened by ligamen- tous fibres, which’ serve as a capsule; and behind, several strong bands pass from the ridge of the ilium to the back of the sacrum; sometimes the bones are united by anchylosis. At the lower part, additional strength is obtained by two large and ‘strong ligaments, which pass from the ischium to the sacrum, and therefore are called tle sacro-sciatic liga- ments. ‘The innermost of these arises from the spine of the ischium, is very strong, but at first not above a quarter of an inch broad ; it Bratiially expands, however, becoining at its insertion about an inch and a quarter in breadth. It passés on to the sacrum, and is implanted into the lower part of the side of that bone and the upper part of the coccyx. It con- verts the sacro-sciatic notch into a regular oval hole, the infe- rior end of which, owing to the neat expansion of the liga- ment, is as round and exact as the upper. As it makes a similar expansion downwards, there is a kind of semilunar notch formed betwixt it and the coccyx. The outer liga- ment may be said to arise from the side of the sacrum, and, like the other, is broad at that part. It runs for some time in contact with the inner ligament, and parallel to it; but afterwards it separates, passing down to be inserted in the tuber ischii; and, when the ligaments separate, their surfaces are no longer parallel to each other. There is, in conse- quence of this separation, a small triangular opening form- ed betwixt the ligaments; or rather there is an aperture like a bow, the string being formed by the under ligament, and
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