Describe the autonomic nervous system
- 2 Neurone process to the effector
- First is pre-ganglion and second is post-ganglionic
Fill the gaps
What organs receive both sympathetic and parasympathetic fibres
Most visceral organs
What fibres are in the autonomic nervous system
- Visceral motor efferents
- General sensory afferents
What does the autonomic nervous system innervate
- Smooth muscle (organs)
- Cardiac muscle (heart)
- Glands
What are the visceral
Main organs in the body cavity, especially abdomen
Describe the sympathetic section of the autonomic nervous system
- Widespread effect: synapses to many neurons
- Respond to dangerous situation very fast
- Interconnected chain of ganglia on either side
- Permits fibres to ascend or descent beyond T1-L2
What is the role of the autonomic nervous system
Monitors conditions in the internal environment to maintain homeostasis
What do the autonomic visceral sensory (afferent) fibres do
Take information from the sensory receptors of the organs to the CNS via the dorsal root
What do the autonomic visceral motor (efferent) fibres do
Take information from the CNS to the organs via the ventral root
What is the difference between the autonomic visceral fibres and the somatic visceral fibres
Autonomic fibres originate from the LATERAL grey horn (T1-L2 & S2-S4)
Somatic fibres originate from sensory receptors in visceral organs
Where do the parasympathetic neurons arise from
- Brainstem (CN 3,7,9,10)
- Spinal cord (S2-S4)
Where do the sympathetic neurons arise from
T1-L2 ONLY
Whats the difference between the post-ganglionic fibres in the parasympathetic and sympathetic systems
Parasympathetic - Releases Ach
Sympathetic - Releases Adrenaline/noradrenaline
What are the different ways preganglionic neruons can synapse with post-ganglionic neurons in the sympathetic division
- Synapse at entry level
- Pass through sympathetic trunk without synapsing
- Ascend or descend in trunk to synapse in the trunk
