Transcript 6. Peripheral Nervous System

Central Nervous System
(Brain and Spinal Cord)
Peripheral Nervous System
(Nerves and Ganglia)
Peripheral Nervous System
• Somatic N.S.
Skeletal
Muscle
• Autonomic N.S.
Parasympathetic
Division
Sympathetic
Division
Cardiac, Smooth Muscle and Glands
Somatic Nervous System (SNS)
CNS
One motor neuron to a single effector tissue:
Effector Tissue
1. Skeletal muscle
Autonomic Nervous System (ANS)
Two motor neurons to many effector tissues:
Effector Tissue
1. Cardiac muscle
2. Smooth muscle
3. Glands
Somatic Nervous System (SNS)
One Motor Neuron to Single Effector Tissue
skeletal
muscle
Effector Tissue is Skeletal Muscle
Neurotransmitter is ACh (released from somatic motor neurons)
Receptors are Nicotinic (response is always excitatory)
Control is Voluntary (except reflexes)
Somatic Motor Pathway
Autonomic Nervous System (ANS)
Two Motor Neurons to Many Effector Tissues
1. cardiac
2. smooth
3. glands
Effector Tissue is Cardiac and Smooth Muscle and Glands
Neurotransmitters are ACh and NE
(released from autonomic neurons)
Parasympathetic:
Receptors are Nicotinic and Muscarinic
Sympathetic:
Receptors are Nicotinic, Alpha () and Beta ()
Preganglionic fibers myelinated; postganglionic are non-myelinated
Control is Involuntary (except biofeedback)
Effector Tissue
Heart
Pupils
Bronchioles
Lacrimal Glands
Salivary Glands
Digestive Activity
Adrenal Gland
Blood Vessels
PARA
SYM
Autonomic Pathways
Somatic