Class notes

Autonomic nervous system

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Course
KPE260 (KPE260)

Institution
University Of Toronto (U Of T )

This document is one of my best written set of notes. The autonomic nervous system is so detailed and has many elements, and I was able to cover all the material necessary. With these notes, I knew how to do any question related to autonomic nervous system on my midterm test. I also provided lots o...

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Uploaded on November 21, 2022
Number of pages 9
Written in 2022/2023
Type Class notes
Professor(s) Marius locke
Contains Human physiology

dopamine
divergence
convergence
preganglionic neurons
postganglionic neurons
somatic nervous sytem
acetylcholine
epineprhine
norepinephrine
autonomic ganglia
sympathetic
parasympathetic
myelinated neu

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Chapter 10:

➢ Describe the organization of autonomic motor neurons

What are autonomic neurons (AN)?
- A network of nerves throughout your body that can control/regulate unconscious processes such as
breathing and heart beating
- Two neuron chain
- Extends from CNS to an innervated organ
- The other division of the motor nervous systems (the other one is the somatic nervous system)

Where are parasympathetic ganglia located?
- Next to or within the organs innervated

What type of axon is involved in the parasympathetic and sympathetic nervous systems?
- Lightly myelinated preganglionic axon which joins with a non myelinated postganglionic axon

What is the difference between myelinated and unmyelinated neurons?

What are preganglionic AN?
- Arise from the CNS
- Cell bodies are located in the brain or spinal cord
- Supplies to the autonomic ganglia
- Thin, lightly myelinated fibers, type b fibers
- Synapses with one postganglionic neuron

What are postganglionic AN?
- Originate in ganglion
- Thinner non-myelinated fibers, type c fibers
- Synapses with more than one presynaptic neuron
- Innervates effector organ

*In general, postganglionic endings of the sympathetic nervous system secrete norepinephrine and are said to be
adrenergic

, What are autonomic ganglia?
- Sympathetic and parasympathetic cell bodies
- Located in the head, neck and abdomen as well as in chains along either side of the spinal cord

What is the difference between somatic and autonomic systems?

What is the difference between parasympathetic and sympathetic nervous systems?

➢ Examples of practice quiz questions (neurotransmitters, ganglia, symptoms of systems)

What neurotransmitter is released from the axon terminals of preganglionic sympathetic fibers?
- Acetylcholine

What neurotransmitter is released from the postganglionic sympathetic neurons?
- Norepinephrine

What neurotransmitter is the primary neurotransmitter released from postganglionic parasympathetic neurons?
- Acetylcholine

Which molecule is the most abundant signaling molecule released from the adrenal medulla?
- Epinephrine

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