. The crayfish : an introduction to the study of zoology . Crayfish. NERVOUS TISSUE. 189 off a branch, more ot fewer of these tubes divide, sending off a prolongation into each branch. When quite fresh, the contents of the tubes are per- fectly pellucid, and without the least indication of struc- ture ; and, from the manner in which the contents. Fig. 55.—Astaong fluviatilis.—Three nerve fibres, with the jonnective tissue in which they are imbedded (magnified about 250 diameters); n, nuclei. exude from the cut ends of the tubes, it is evident that they consist of a fluid of gelatinous consiste
. The crayfish : an introduction to the study of zoology . Crayfish. NERVOUS TISSUE. 189 off a branch, more ot fewer of these tubes divide, sending off a prolongation into each branch. When quite fresh, the contents of the tubes are per- fectly pellucid, and without the least indication of struc- ture ; and, from the manner in which the contents. Fig. 55.—Astaong fluviatilis.—Three nerve fibres, with the jonnective tissue in which they are imbedded (magnified about 250 diameters); n, nuclei. exude from the cut ends of the tubes, it is evident that they consist of a fluid of gelatinous consistency. As the fibre dies, and under the influence of water and of many chemical re-agents, the contents break up into globules or become turbid and finely granular. Where motor nerve fibres terminate in the muscles to wliich they are distributed, the sheath of each fibre becomes continuous with the sarcolemma of the muscle, and the subjacent protoplasm is commonly raised into a small prominence which contains several nuclei (fig. 52. F). These are called the terminal or motor 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 Huxley, Thomas Henry, 1825-1895. London : Kegan Paul, Trench, Tru?bner & Co.
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Keywords: ., bookauthorhuxleyth, bookcentury1900, bookdecade1900, bookyear1906
