THE
NERVOUS
SYSTEM
NEURONS
--a nerve cell that is specialized to transfer
messages in the form of fast-moving
electrical energy
NEURON STRUCTURE
• Cell body
contains
nucleus &
organelles
• Dendrites—
extension of
the cell that
receives info
from other
cells
• Axons can be almost
1m long
• The tip is called the
axon terminal
SENSORY NEURON
• collect
Information
• Receptors—
specialized
nerve endings
•
•
Detect
changes
inside and
outside the
body
Ex. Eye
detects light
MOTOR NEURONS
• Send impulses
from the brain
and spinal cord
to other
systems
• Muscles get
impulses from
Motor
Neurons=musc
les contract
NERVES
• Collection of
axons bundled
together with
blood vessels
and connective
tissues
• Everywhere in
PNS
SPINAL CORD