AN SC 310 - 12
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AN SC 310 - 12
AN SC 310
Lecture 12 - The Autonomic Nervous System
What branch of the vertebrae is involved in the SNS?
What is the main function of the ANS?
What nerve innervates most of the pSNS?
Cranial nerve X
How does the pSNS differ from the SNS?
1 nerve innervates effector organs
Pre-ganglionic nerve long, post-ganglionis nerv short
What are 2 exceptions to the general ganglion anatomy in the SNS?
Collateral ganglia - outside chain
Adrenal medulla - no ganglia
What is the preganglionic sympathetic pathway?
White ramus (axons)
What is the postganglionic sympathetic pathway?
What are the parasympathetic nerves?
Cranial nerves X, III, VII, IX
What are the neurotransmitters of the ANS?
What are the hormones of the Adrenal Medulla?
Catecholemines - 80% epinephrine, 20% norepinephrine, <1% dopamine
What are the 2 types of cholinergic receptors?
What do nicotinic cholinergic receptors do?
Cause cation channel opening = depolarization
How do muscarinic cholinergic receptors work?
What are the 2 classes of Adrenergic Receptors? What are they coupled to?
Alpha and Beta
What are autonomic neuroeffector junctions?
Synapses btwn efferent and effector organ in ANS
Where is neurotransmitter stored in neuroeffector junctions?
What are the 6 events that occur at the neuroeffector junctions?
1.AP arrives at varicosity
2. Ca2+ channels open
3. Exocytosis of neurotransmitter
4. NT binds w/ receptors of effector organ
5. Response in effector organ
6. NT degraded, diffuses away, re-uptake
What is an example of dual innervatin of autonomic control?
What is meant by "Dual Innervation" of the ANS?
Both division, pSNS and SNS, innervate most effector organs