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Theme7. TheVisceral (Autonomic) Motor NervousSystem (Organization of the…
Theme7. TheVisceral (Autonomic) Motor NervousSystem
ii.The sympathetic and parasympathetic divisions.
Sympathetic
toraco-lumbarspinal nerves.
Parasympathetic
CranialIII,VII,IX,andXnerves
Sacral(splachnic)nerves.
Theentericnervoussystem(notshown)includestheneuronsandnervefibersinthemyentericandsubmucosalplexuses
Whilesympatheticgangliaarelocatedatsomedistancefromtheirtargetorgans
i.The visceral motor system.
The visceral (or autonomous) motor system controls smooth muscle fibers, cardiac muscle fibers, adipose tissue, and glands.
B.Sympathetic system
C. Parasympathetic system
A. Enteric nervous system
D. Central Visceral control
iv.The enteric nervous system.
The brain in your gut
Myenlenic plexus
Lumen
Submucosal Plexus
Afferentneuronssupplymechanoreceptorswhichsentinputstotheentericplexus.
Organization of the autonomic nervous system
Anatomy
Two-motorneuron(A)versusone-motorneuronpathways.
Neurotransmitters
Acetylcholine(S)vs.Acetylcholine/Epinephrin(A)
Effector organs
Internalorgans(A)vs.Skeletalmuscles(S).
Actions
involuntary(A)vs.conscious(S).
Myelin
unmyelinatedpostganglionic(A)vs.myelinatedfibers(S).
Receptors
Muscarinic/Adrenergic(A)vs.Nicotinic(S).
