Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . fro™ *s, ,, . & &. i sheath and highly magnified, here and there in particular nerves. The cineritious, or grey nervous substance,wherever it occurs,beit deep seated or superficial, consistsof aggregations of these ganglioniccorpuscles. They have always acertain quantity, more or less, of thetubular or primary fibrous structuremixed with them ; the more abun-dant the primary fibres, the lighteris the mass ; the fewer they are, thedarker i
Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . fro™ *s, ,, . & &. i sheath and highly magnified, here and there in particular nerves. The cineritious, or grey nervous substance,wherever it occurs,beit deep seated or superficial, consistsof aggregations of these ganglioniccorpuscles. They have always acertain quantity, more or less, of thetubular or primary fibrous structuremixed with them ; the more abun-dant the primary fibres, the lighteris the mass ; the fewer they are, thedarker is its colour. The ganglioniccorpuscles, particularly in the brainand spinal cord, are much more de-licate and easily destroyed than theprimary fibres. To study them, it iswell to begin with the Gasserian ganglion of a small animal, such as ?u., ,1 . r p Fig. 15.—Second abdomi- a rabbit, or a thoracic ganglion of a nal gsanglion of the gympatbe. small bird (figs. I 6, B. 17, a). Here tic nerve of the Fringilla spi-they mostly appear as globular or oval, mis, to show the course of theindistinctly granular bodies, having primary fibres. I) 2. 36 XERYOUS SYSTEM AND GENEEAL SENSATION. i
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870
