Bauhaus-Universität Weimar

the NERVES. 
BEFORE we enter upon the fubjedt of the following obferva- 
tions, it may be proper to make a few remarks concerning the 
ftrudture, ufe, and fympathy of the nerves. 
i. The nerves are thofe fmall cords, which riling from the brain 
and fpinal marrow, are diftributed to every part of the body. They 
appear to be no more than continuations of the medullary fubftance 
of the parts from whence they proceed, and owe their ftrength and 
firmnefs to the membranes and cellular texture which furround 
2. The larger nerves (i.) are evidently compofed of many fmal- 
ler ones, which run parallel to each other, and feem to be quite di- 
ftimft from their origin to their termination, without any fuch com¬ 
munications between their branches as are obferved every where in 
the fyftem of arteries and veins. 
3. The fmalleft nervous filaments that can be traced by diflec- 
tion are füll compofed of lelfer threads ; fo that we can have no 
idea of the exility of a fingle nervous fibril. 
4. Altho’ it feems probable that the nerves (3.), which are con¬ 
tinuations of the medullary fubftance of the brain and fpinal mar¬ 
row, derive from thence a fluid ; yet the extreme fmallnefs of the 
nervous tubes, and the fubtility of that fluid which they contain, make 
us altogether ignorant of its peculiar nature and properties. Nor do 
we know, certainly, whether this fluid lerves only for the nouriih- 
ment and fupport of the nerves, or whether it be not the medium by 
which all their adlions are performed. 
5- The nerves communicate fenfe and a power of motion to the 
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