L14: Organisation Of The Autonomic NS Flashcards
What are the main structures of a neurone
Cell body
Axon
What is the anatomical classification of the nervous system
Central nervous system
Peripheral nervous system
What is functional classification of the nervous sytem
Autonomic nervous system
Somatic nervous system
What does the autonomic nervous system involve
Sympathetic
Parasympathetic
Enteric
What is the general action of the autonomic nervous system
Maintains homeostasis
Promotes excretory mechanism of the body when necessary
What are the effector organs of the autonomic system
Visceral organs
What does the visceral organs of the autonomic system involve
Smooth muscle
Secretory glands
Cardiac muscle
Is the somatic nervous system under voluntary or involuntary control
Voluntary control
Is the autonomic system under voluntary or involuntary control
Involuntary
What is the general layout of the autonomic nervous system
2 neurones in series
1 cell body in the cns
1 cell body in the PNS
What are the 2 neurones in the series called
Pre ganglion
Post ganglion
What neurotransmitter does the pre ganglionic axon of the parasympathetic ns release
Acetylcholine
What neurotransmitter does the post ganglionic axon of thf the parasympathetic ns release
Acetylcholine
Which receptor does acetylcholine from the parasympathetic pre ganglion act on
Nicotinic receptor
Which receptor does acetylcholine from the parasympathetic post ganglion act on
Muscarinic receptor
What neurotransmitter does the sympathetic pre ganglionic axon release
Acetylcholine
What neurotransmitter does the sympathetic post ganglionic axon release
Noradrenaline or adrenaline
What receptor does acetylcholine from the sympathetic pre ganglionic axon act on
Nicotinic receptor
What receptor does adrenaline/noradrenaline from the post ganglionic axon act on
Alpha or beta adrenoceptors
Describe the relationship of sympathetic and parasympathetic ns
Dual innervation but have opposite effects
How is the overall dominant effect from SNS and PNS action determined
From the balance of the PNS and SNS outputs
What innervation does sweat glands receive
Sympathetic only
Which 2 sources are origination of autonomic fibres
Cranial sacral source
Thoracolumbar sources
Which source is for parasympathetic
Cranial-sacral
Which source is for sympathetic
Thoracic-lumbar sources
What is a thoracic lumbar source
All segments of the spinal cord between T1-L2
What is the crania-sacral source
Cranial nerves: 3,7,9,10
Spinal cord: S2,S3,S4
Where are parasympathetic pre-ganglionic neurones found in the body
Dorsal vagus motor nucleus
OR
Spinal segments S2-S4
What is the action of parasympathetic CN3
Pupillary constriction
What is the action of parasympathetic CN7
Serous secretions
What is the action of parasympathetic CN9
Serous secretions
What is the action of parasympathetic CN10
Laryngeal function -neck only
Rest of body
Viscera
What is the major pre-ganglionic fibre in the parasympathetic system
Vagus nerve
Where does the parasympathetic vagus nerve synapse for the post-ganglionic neurones
Walls of the target organ
Where does parasympathetic pre-ganglionic CN3,7,9 terminate for the post-ganglionic neurone
At pre-ganglionic nucleus
Where does the sympathetic pre-ganglions originate from
Spinal neural levels of T1-L2/3
Where does sympathetic preganglionic neurones terminate into post-ganglions
3 ways:
Synapse at level of corresponding level
Synapse at different level (up or down)
Synapse in prevertebral chain
What is the paravertebral chain
A chain lying also give the vertebral column bilaterally
What is the prevertebral chain
Lies anterior to vertebral bodies in relation to carotid and abdominal aorta
