Archive image from page 510 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 SYMPATHETIC NERVE. 435 characteristic specimens of either are examined the difference is sufficiently marked ; yet in Fig. 285. From a branch of the coccygeal nerve inside the dura mater of Man. (Mag. 3oO diam.) After Kolliker. some parts of the branches of the sympathetic in the higher animals it is difficult to limit the two species of tissue, and between the most characteristic of the fibres and many em- bryonic tissues the most marked resemblance exists
Archive image from page 510 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 SYMPATHETIC NERVE. 435 characteristic specimens of either are examined the difference is sufficiently marked ; yet in Fig. 285. From a branch of the coccygeal nerve inside the dura mater of Man. (Mag. 3oO diam.) After Kolliker. some parts of the branches of the sympathetic in the higher animals it is difficult to limit the two species of tissue, and between the most characteristic of the fibres and many em- bryonic tissues the most marked resemblance exists. In the ultimate distribution of the sympathetic there seem to be, as Kolliker observes, none but fine tubular fibres present. If, then, the fibres of Remak be kept out of consideration, as not being possessed of the properties of nerve-fibres, are there any fibres in the sympathetic which can be regarded as differing in their anatomical constitution from those occurring in the nerves belonging to the cerebro-spinal system? In 1842 Bidder and Volkmann described particularly the distinc- tion in point of structure between the tubular fibres, which have been mentioned as being present in the sympathetic. They measured the tubular fibres, and found that while some of them had a diameter of O'OOOiG to 0-00068 of an inch, others measured only O'OOOIS to 0'00022; and between the two sizes they observed no fibres of intermediate breadth. They also measured the branches which enter and those which leave the ganglia in the frog. The latter were found to exceed the former in point of thickness, which could only be at- tributed to the addition of structures arising in the ganglia, and on examination they ob- served that the increase in thickness of the one over the other was due to the presence of a greater number of tubular nerve-fibres belonging to the finer variety ; and hence it was concluded that these are the peculiar organic or sympathetic fibre. The coarser variety they regarde
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