Abstract

In order thoroughly to understand the mobility of the human spine, it is advisable to subdivide the subject matter to be discussed into its respective component parts: 1. The anatomy and the physiology of the spinal column. 2. The mechanics and dynamics. 3. The foramina for the nerve exits and the connective links between the cerebrospinal and the sympathetic nervous system. 4. The mobility of the spine, with the proofs of this mobility. 5. The clinical application of this knowledge. ANATOMY OF THE SPINE The spinal column is made up of a series of separate bone segments called vertebrae, thirty-three in number, divided into seven cervical, twelve dorsal, five lumbar, five sacral and four coccygeal. In adult life, with the exception of rare cases, the parts making up the sacral portion are fused, forming one bone, called the sacrum, and the four coccygeal bones make up the coccyx. The vertebrae

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