The top floor of the sacrum, having to maintain the total weight of the spinal column, is extensive and flat, and corresponds to the reduce floor of the final lumbar vertebra. Its anterior floor kinds with that of the opposite pointed out bone a substantial angle,[Pg 17] which initiatives forwards and roughly downwards in the direction of the symphysis pubis, and is termed 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 in depth concavity upon its anterior floor: this can be termed the hole of the sacrum.
Coccyx. The reduce finish is lengthy by way of a small bone, known as Coccyx or os Coccygis, from its intended resemblance to a cuckoo’s beak. it always comprises 4, and infrequently (especially in ladies) 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 while the bones are absolutely shaped, they're united by means of intermediate cartilage, and hence hold loads mobility upon one another, in addition to upon the decrease finish of the sacrum, as to confess of being pressured backwards to the level of a whole inch, therefore contributing enormously to extend the skill of the outlet.
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Extra resources for A System of Midwifery
A System of Midwifery