Motor Neurons: The
nerves that carry the
stimuli that cause your
body's muscles to contract
are motor
neurons. Their structure is different from
sensory neurons. The cell body or perikaryon
(A) is filled with chromatophilic substances
which pick up the stain in this micrograph.
The cell's axon can not be distinguished from
its dendrites in the micrograph. B marks the
axon and dendrite threads. The "C's" marks the
neuroglia cells (dark spots) and the
neurofibrils.
Motor End Plate:
Skeletal muscles (C) are stimulated by nerve
impulses carried by motor neurons. An axon (A)
that carries the impulse away from the nerve
body ends in little pads on muscle fibers
called motor end plates (B).
Spinal
Cord:
mmmmmmmmmmmmmmmmm
"A" marks the central canal. "B" is the
anterior medial fissure. The posterior medial
sulcus is not seen in this preparation. C is
the posterior horn composed of axons of the
sensory neuron. D is the anterior horn
composed of the cell bodies of motor neurons.
C and D are gray matter. Outside the horns and
the commissure that connects them is the white
matter.
