Autonomic Nervous System & Divisions of the ANS - ANS vs Somatic nervous system
4 important questions on Autonomic Nervous System & Divisions of the ANS - ANS vs Somatic nervous system
Name the 3 area in which ANS differ from SNS?
- Effectors
- ANS, smooth muscle, glands and cardiac muscle
- SNS, skeletal muscle + joints
- efferent pathways
- SNS, mylelinated fibres straight to skeletal fibers
- ANS, preganglionic (first) neuron in spinal cord (myelinated) → ganglionic (second) neuron outside CNS (unmyelinated) → effector organ
- neurotranmitter effects
- SNS, all release Acetylcholine (ACh)
- ANS, Preganglionic fibers release Ach. Postganglionic fibers release norepinephrine (sympathetic) and Ach (parasympathetic)
- effect depends on receptor on effector organ
Which region of the spinal cord grey matter do you find SNS nuclei and ANS nuclei?
- Motor division nuclei is found on the anterior/ventral grey horn
- anteriolateral for ANS therefore for noth SANS&PANS
- the very anterior/ventral region on theg grey horn
Name the chemical that causes direct activation of Na+ channel of skeletal muscles
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What is the name of Motor Endings at visceral organs?
what are their structrual characteristics?
what does term "Synapses en passant" mean
bulbous swellings
when a neuron releases chemiicals (acetycholine/norepinephrine) from varicosities, passing through narrow shaft
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