478 = On the Nervcus Systeins-of 
term is adopted by writers on comparative arta 
atomy. 
The spinat MARRow is so tamed from its 
occupying the canal, formed by the vertebra, 
or bones of the spine, and is generally con- 
sidered as a continuation, or production of the 
brain.*—In animals, which have no vertebra, 
that part of the nervous system, which is con- 
tinued from the brain and is connected with the 
nerves, is also named spinal marrow, though not 
very properly. 
The nerves are cordlike bodies, rising in 
pairs from the brain and spinal marrow and 
ramifying in order to be distributed to the dif 
ferent parts, that are influenced by them.—That 
# By somie writers the spinal marrow is considered a¢ 
the largest nerve of the body, but improperly according to 
Soemmerring: “Nota enimejusab omnium nervorumnotis 
sunt diverse, cerebri vero notis respondent.Etenim 1. Non 
ca est medullé spinz structura filata, qua omnibus qui- | 
dem nervis, 2. Molliof est nervo. 3. Intrinsecus, ut aliz 
guedam cerebri partes, portionem cineream continet. 
4. Eodem modo ex ea nervi oriuntur, ut v- g. ex cerebro 
tertius & sextus nervus, nequaquam vero ea ratione, 
qua nervi ex truncis, qui dividuntur, vel ex gangliis 
oriuntur. §. Bestiis maxima pars est massa cerebri, 
6, Homini,ratione cerebri habita, minor est, quam ulli alii 
animali. 7, Stimuli metallorum per spinz medullam 
spasmos non excitant, ut per nervos.” DeCorp, Hum, 
Fab, T. 1V, p. 81. 
