The higher floor of the sacrum, having to maintain the total weight of the spinal column, is vast and flat, and corresponds to the decrease floor of the final lumbar vertebra. Its anterior floor types with that of the opposite pointed out bone a substantial angle,[Pg 17] which tasks forwards and kind of downwards in the direction of the symphysis pubis, and is named the promontory of the sacrum. underneath this element, the sacrum takes a substantial sweep backwards because it descends, progressively advancing back forwards, as we process its inferior extremity, forming an intensive concavity upon its anterior floor: this is often termed the hole of the sacrum.
Coccyx. The decrease finish is lengthy through a small bone, referred to as Coccyx or os Coccygis, from its intended resemblance to a cuckoo’s beak. it always comprises 4, and occasionally (especially in girls) of 5 parts; they're much smaller than the bones of the sacrum, and are very imperfect rudiments of vertebral formation; like those, they're at an early interval little else than cartilage, or even whilst the bones are absolutely shaped, they're united by way of intermediate cartilage, and hence continue lots mobility upon one another, in addition to upon the decrease finish of the sacrum, as to confess of being compelled backwards to the level of a whole inch, therefore contributing drastically to extend the potential of the outlet.
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Extra info for A System of Midwifery
A System of Midwifery