. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. .346 THE MECHANICAL FUNCTIONS. parallel to each other the whole length of the body : but in process of time these two filaments unite, and constitute a single spinal cord: and the pri- mary type of the skeleton is determined by the peculiar form of this, the central organ of the ner- vous system. In laying the foundations of the skeleton, then, the tirst object is to provide for the security of the spinal cord ; and this is accomplished by enclosing it withi
. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. .346 THE MECHANICAL FUNCTIONS. parallel to each other the whole length of the body : but in process of time these two filaments unite, and constitute a single spinal cord: and the pri- mary type of the skeleton is determined by the peculiar form of this, the central organ of the ner- vous system. In laying the foundations of the skeleton, then, the tirst object is to provide for the security of the spinal cord ; and this is accomplished by enclosing it within a series of cartilaginous rings, which are destined to shield it during its growth, and, by their subsequent ossification, to protect it most effectually from all injurious pressure. It is this part of the skeleton, accordingly, of which the rudiments appear the earliest in the embryo animal. Tliese rings form a column, extending in a longi- tudinal direction along the trunk; retracing to us the series of horny rings, in which the bodies of worms, of insects, and indeed of all the Articulala, are encased. When ossified, these several rings are termed vertebrcs; and the entire column which they compose is the Spine. Fig. 177 shows the. form of one of the vertebrae of the back in the human skeleton. Fig. 178 is a side view of four. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Roget, Peter Mark, 1779-1869. London : W. Pickering
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