. Diseases & disorders of the horse : a treatise on equine medicine and surgery. Horses; Horses -- Diseases; Horse Diseases. 95 range of influence, and in mode of action. The cerebro-spinal system includes the brain and spinal cord, and the \arious ner\-es proceeding from them. The sympathetic system consists of a double chain of nervesâone .on each side of the backboneâfrom Avhich branches are distributed. The Tier\'0us apparatus is made up of two ultimate factors, nerve-fibres and nerve-cells, and these are intimately associated together. The cells are â collected together in groups or m
. Diseases & disorders of the horse : a treatise on equine medicine and surgery. Horses; Horses -- Diseases; Horse Diseases. 95 range of influence, and in mode of action. The cerebro-spinal system includes the brain and spinal cord, and the \arious ner\-es proceeding from them. The sympathetic system consists of a double chain of nervesâone .on each side of the backboneâfrom Avhich branches are distributed. The Tier\'0us apparatus is made up of two ultimate factors, nerve-fibres and nerve-cells, and these are intimately associated together. The cells are â collected together in groups or masses, and are always mingled more or less with fibres, and both together form what is termed a '' ner\; The fibres, besides entering into the composition of nerve-centres, form nerves, which connect the different centres, and are distributed to the various parts of the individual. Nerve-cells and nerve-fibres differ in function. The fomier generate and conduct nerve force, while the latter merely conduct it. We may compare the nervous system with a galvanic battery, and the telegraphic wires proceeding from it. The batteiy, like the nerve centre, generates and conducts the current; while the wires, like the ner\'es, merely conduct it, having no share whatever in its production. Nervous force travels at a ver>^ quick rate. It has been calculated by physiologists, that the rate of conduction in human nerves supplying muscles with motor power is 111 feet per second, and that in those nerves by which sensation is conducted, it is still quicker, reaching as high as 140 feet per second. Each nerve is composed of a variable number of bundles of nerve-fibres, which have separate sheaths. The bundles of fibres, also, have separate sheaths, and the whole of them in turn are enclosed in a firm fibrous covering. , J \ Y'. 4> Figure A shows a ner\^e fibre (after Klein) magnified 300 times, i is the sheath, 2 is the medulla, and 3 is the axis-cylinder. Th# constricti
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Keywords: ., bo, bookcentury1800, booksubjecthorses, booksubjecthorsesdiseases
