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Questions and Answers
What are the two major portions of the autonomic nervous system?
Which division of the autonomic nervous system is associated with the thoracic and lumbar spinal nerves?
Which neurotransmitter is primarily released by most postganglionic sympathetic fibers?
Which of the following is NOT one of the five key features of neurotransmitter function?
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What is the term used for fibers that synthesize and release acetylcholine?
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Study Notes
Autonomic Nervous System Divisions
- The autonomic nervous system (ANS) has two main branches, sympathetic (thoraco-lumbar) and parasympathetic (cranial).
- The sympathetic part originates from the thoracic and lumbar spinal nerves, while the parasympathetic part arises from cranial nerves (3rd, 7th, 9th, and 10th) and the 3rd and 4th sacral spinal nerves.
Autonomic Nervous System Neurotransmitters
- Autonomic nerve fibers are classified based on their neurotransmitter release.
- Cholinergic fibers release acetylcholine (ACh).
- Cholinergic fibers include all preganglionic fibers, many postganglionic parasympathetic fibers, and somatic fibers.
- Noradrenergic fibers (or adrenergic fibers) release norepinephrine (noradrenaline).
- These noradrenergic fibers are primarily postganglionic sympathetic fibers.
- The adrenal medulla releases a mix of epinephrine (adrenaline) and norepinephrine.
Key Features of Neurotransmitter Function
- These aspects of neurotransmitter function represent potential targets for pharmacological interventions.
- Key features:
- Synthesis of neurotransmitter
- Storage of neurotransmitter
- Release of neurotransmitter
- Activation of receptors by neurotransmitter
- Termination of action of neurotransmitter
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Description
Explore the divisions and neurotransmitters of the autonomic nervous system in this quiz. Understand the roles of sympathetic and parasympathetic branches, as well as the importance of cholinergic and noradrenergic fibers. Test your knowledge on these essential components of the nervous system.
