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16 Cards in this Set
- Front
- Back
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What two branches is the nervous system split into?
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Central Nervous System and Peripheral Nervous System
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What branches is the Peripheral nervous system split into?
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Somatic, Autonomic & Enteric
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What branches is the Autonomic Nervous system split into?
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Sympathetic and Non-Sympathetic
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What is somatic branch of the PNS responsible for?
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Skeletal movements
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What is the Autonomic branch of the PNS responsible for?
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Cardic and lung movements (Hence why it is divided into the branches responsible for fight/flight)
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What is the enteric branch of the PNS responsible for? |
Gut motility |
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Communication within the PNS is done by Afferent and efferent nerve fibres. Where do these fibres lead to and from? |
Afferent = From the PNS to the spinal cord or brain stem Efferent = From the brainstem or spinal cord to the PNS |
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Do somatic fibres relay to a ganglion? |
No, nerve fibres of the somatic NS usually relay directly to the NMJ of the skeletal muscle fibre. |
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What neurotransmitter is released at the NMJ in the somatic NS? |
Acetylcholine is always released at the NMJ of the somatic nervous system. The response is always going to be excitatory. |
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Where do efferent fibres originate from in the somatic nervous system? |
Brain stem/ Ventral horn of the spinal cord |
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Where do pre-ganglion neurones originate from in the parasympathetic nervous system? |
Brain stem/ Lateral horn of spinal cord |
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What is a ganglion? |
A collection of nerve cell bodies. In the autonomic nervous system, they are used to relay signals between pre-ganglionic and post-ganglionic nerve fibres. |
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What neurotransmitter is released from the ganglion? |
Acetylcholine is always released from the ganglion, regardless of the effecter cell. |
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What neurotransmitter is released from the post-ganglionic terminal in the parasympathetic nervous system? |
Always acetylcholine. |
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How is adrenaline release modulated by the sympathetic nervous system? |
1. Pre-ganglionic nerve fibres originating in the lateral horn of the spinal cord, project directly towards the adrenal medulla 2. ACh is released into the adrenal medulla 3. The adrenal medulla releases mostly epinephrine and some noradrenaline into the blood stream |
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What neurotransmitter is released by most post ganglionic nerve fibres of the sympathetic nervous system? What is the exception? |
Most post-ganglionic nerve fibres of the sympathetic nervous system release NORADRENALINE. The exception to this is the fibre relaying to the sweat glands, which releases ACETYLCHOLINE |
