Autonomic Nervous System Flashcards
What are the two main subdivisions of the NS?
Somatic
Autonomic
What is the ANS governed by? and how does it act?
Self-governing
Reflex arcs
What are the two subdivisions of the ANS?
Sympathetic
Parasympathetic
Where do the nerve fibres leave the spinal cord in the Sympathetic NS?
Thoracic and Lumbar segmental fields
THORACOLUMBAR
Where do the nerve fibres leave the spinal cord in the
Parasympathetic NS?
Cranial and Sacral
CRANIOSACRAL
Can both divisions of the ANS supply the same organ?
Yes, dual innervation
What do both divisions have in common?
They both have a two neurone output pathway
Is the sympathetic pre ganglionic fibre long or short?
SHORT
Is the parasympathetic pre ganglionic fibre long or short?
LONG
What are the two neurotransmitters in the SNS?
ACh and NA
What neurotransmitter is used in the PNS?
ACh
What neurotransmitter does the SNS use at the target organ?
NA
What neurotransmitter does the PNS use at the target organ?
ACh
What secretes adrenaline and noradrenaline into the blood?
The adrenal medulla
Which nervous system dominates at rest?
PNS
Can the same neurotransmitter have a different actions on different tissues?
Yes
What are the two types of Noradrenaline receptor?
Alpha
Beta
What are the two types of Acetylcholine receptors?
Muscarinic
Nicotinic (Autonomic ganglia and skeletal neuromuscular junction)
What are the two types of Acetylcholine receptors?
Muscarinic (PNS target organs)
Nicotinic (Autonomic ganglia and skeletal neuromuscular junction)
how does the drug propranolol act?
It is a beta blocker and works by blocking the effect of NA on beta receptors (SNS)
How does the drug atropine work?
It is a muscarinic blocker that blocks the effect of acetylcholine on muscarinic receptors
What are the four F’s of the SNS?
Fear, Fight, Flight and Fucking
What does the acronym SLUDD represent in the PNS?
Salivation Lacrimation Urination Digestion Defecation