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At the base of the skull, the backbone begins. The skull is supported by the topmost cervical (neck) vertebra. The curious thing about a backbone is that the word has come to suggest something solid, straight, and unbending.
The back, however, just isn't like that: it consists of 26 knobby, hollowed-out bones- vertebrae, rather improbably held together by muscles, ligaments, and tendons. Is is not straight when we stand, but has definite backward and forward curvatures; and even some of its most important structures (the disk between the vertebrae) aren't made of bone, but of cartilage.
All in all, however, the backbone is fairly well designed structure in term of several different functions it serves- but with some built-in weaknesses.
The next post will further explain about The Vertebrae.
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