autonomic nervous system Flashcards
subdivisons of the autonomic NS
parasympathetic and sympathetic
how many neurones are used in the para/symapthetic system
2 pre and post ganglionic fibre
anatomy of the PSNS
long preganglionic neruoens
ganglia in or near target organs
short post ganglionic neurones
anatomy of the SNS
short preganlionic neurones
ganglia near to SC forming the sympathetic chain
long post ganglionic neruones
neurotransmitters of PSNS
Ach
receptors of PSNS
nicotinic (ganglion)
muscarinic (target organ)
neurotransmittors of SNS
Ach
Noradrenaline
receptors of SNS
nicotinic (ganglion)
adrenergic (target organ)
anatomical differences
PSNS
cell bodies of preganglionic PS in brainstem and sacral spinal cord
leave CNS via CN 3,7,9,10
or leave via sacral nerves
where does PSNS synapse
within parasympathetic ganglia that lie close to target
anatomy of the SNS (preganglionic)
cell bodies found in the lateral horn of thoracic SC
where does the SNS synapse
synapse at ganglia with the post ganglionic neurones forming sympathetic chains either side of SC
where are post ganglionic parasympathetic ganglia foundn
close/in target organs
where are post ganglionic sympathetic neurones
distant from target
where do axons of neurones run to reach targets in the sympathetic NC
run along arteries or rejoin spinal nerves