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Peripheral Nervous System
Anatomical
Cranial nerves12 nerve bundles
Spinal nervesIntercostal nerves
& 3 plexuses
Divisions
Spinal Nerves
Spinal Nerves have two parts:Dorsal Root
Sensory neurons Receive impulse
Ventral Root Motor neurons Send impulse
Functional
SomaticAssociated with voluntary movement
Distinguished by a single motor neuron from CNS to effector
Autonomic Involves involuntary
changes/reactionsConsists of 2 (or
more) motor neurons from CNS to effector Connect at the a ganglion
Divisions
Parasympathetic Sympathetic
Originate in the brain stem (or sacral region)
Signal to conserve/absorb energy (relaxed/recovery)
Secrete acetylcholine in the post-ganglionic nerve
Originate in the spinal grey matter
Signal to use energy (fight or flight)
Secrete noradrenalin in post-ganglionic nerve
Autonomic Nervous System