The Autonomic Nervous System Flashcards
Where are preganglionic neurons located?
in the CNS
where are postganglionic neurons located?
in the PNS
compare the size of the parasympathetic pre and postganglionic neurons
parasympathetic:
preganglionic neurons - long
postganglionic neuron - short
where are the cell bodies of parasympathetic preganglionic neurons located?
- ) brain
2. ) sacral spina cord fray matter
where are sympathetic preganglionic neurons located?
thoracolumbar spinal gray matter
compare the size of the sympathetic pre and postganglionic neurons
sympathetic:
preganglionic neurons - short
postganglionic neuron - long
True or false; sympathetic is catabolic
TRUE
what type of neurotransmitter is released at the pre and postganlionic neurone of the parasympathetic division of the ANS?
ACh at both pre and post
There are two kinds of ACh receptors in the parasympathetic division of the ANS. What are they called?
- nicotinic (on the post ganglionic neurone)
2. muscarinic (on the target tissue)
what do pre and post ganglionic neurons in the sympathetic division release?
preganglionic - ACh
postganglionic - norepinephrine
*exception is sympathetic postganglionic innervation of sweat glands
what are the 2 chemical transmission exceptions in the sympathetic division ??
- sweat glands that release ACh at their postganglionic neurone
- adrenal medulla which does not have a post ganglionic neuron and instead itself releases NA and A
describe the effects of parasympathetic and sympathetic action at the pupils
parasymp - constriction
sympathetic - dilation
miosis
constricted pupil
what does the sympathetic innervation do to blood pressure and cardiovascular function?
- increased CO and vasoconstriction (increased BP)
are blood vessels in the skin controlled by sympathetic and parasympathetic innervation?
no, only sympathetic
