Peripheral Nervous System. Anatomical Cranial nerves 12 nerve bundles Spinal nerves Intercostal...
Transcript of Peripheral Nervous System. Anatomical Cranial nerves 12 nerve bundles Spinal nerves Intercostal...
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