NEURONE FIBERS.--The neurone fibers are of two kinds, _dendrites_ and
_axons_. The dendrites are comparatively large in diameter, branch
freely, like the branches of a tree, and extend but a relatively short
distance from the parent cell. Axons are slender, and branch but little,
and then approximately at right angles. They reach a much greater
distance from the cell body than the dendrites. Neurones vary greatly in
length. Some of those found in the spinal cord and brain are not more
than 1/12 of an inch long, while others which reach from the extremities
to the cord, measure several feet. Both dendrites and axons are of
diameter so small as to be invisible except under the microscope.
