382 Renumeration of the Spinal Nerves and Reconstruction (Apel, 
we begin that way), instead of being reckoned irregularly, some 
times by the vertebra above it, sometimes by the vertebra below 
it; and the sets of nerves are all brought into uniform relation 
-with the sets of vertebra, from occiput down to coccyx. The 
difference between the reckoning hitherto in vogue and that now 
proposed may be easily brought to the eye. In the following ex- 
amples of old and new styles the letters are the vertebra, tht 
lower figures being their own numbers, but the upper figures att | 
the numbers of the nerves; thus êd, is first dorsal vertebra ani 
so-called eighth cervical nerve. It will be seen that in the fist 
row no numbers correspond with those of vertebre after “oy, and 
that in the second row all the numbers correspond as longa 
nerves hold out. It will also be seen that the lumbar and sacral 
brings these plexuses into order with their respective V 
{the composition of plexuses being of course the same im 
case): 
Gan 
cv. plex. brach. plex. intercostal nerves. 
AR TE pa eaan P oe fs eves g 
8, 9d. d, ba 9 
Old sty le— c], Ca, Cg Cg Cg Cg Cy ; 8d Md g,2dq,°dy,4d,,Pdg,ody,"dg, dy» ae 
| 9q_ 10, 7. q 
New style—tc, 2cy,8es,4¢4,5c5,%cg,"Cy 5 1d, Pdydytdp'dy "byt te e | 
YL ~- D Noni a 
cv. plex. __ brach. plex. intercostal nerves. 
lumb. plex. sacr. plex. 
a ; ba, Masih, Bey) CCa? C4. 
1 71,,31541,°1, 5 Is, ,255,3s5,45,,555 5 16, 2C5,%Cs,%C,. 
ee 3 
lumb. plex. sacr. plex. i ho 
It is incumbent upon one who proposes inovatia A 
good reason for interfering with established usages- RU oy 
ent case it will be found, on sufficient examination, that 1% bt 
is the numeration of the spinal nerves properly reg b 
the several sets of nerves coincide with the sets of ach mort 
also that the construction of the plexuses may be-t 
easily appreciated and much more simply descr ibed ae he 
fore this rectification is made. Moreover, without ¢ “the [a 
recognized limits and composition of the plexuses m st! 
particular, we make them seem much more natura"? > 
by simply correcting the numeration of their resp 
Furthermore, the proposed rectification is ea 
other animals than man; and in these it is highly 
ag 
. 
