Autonomic nervous system

• What does ANS consist of

  -CNS : brain and spinal cord

  -PNS : cranial and spinal nerves
• structure of nerve

  -has axons blood vessels wrapped in connective tissues
• Nervous system

  Sensory neurones sends info to CNS

  -info from CNS to muscles glands - motor division

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• PNS - Motor Division

  -splits into somatic and autonomic nervous system

  -somatic controls skeletal muscle(voluntary)
• Autonomic NS

  Splits into sympathetic and parasympathetic NS
• effects of ANS

  -control heart beat

  -smooth muscle in lungs

  -digestive system activity

  -kidney
• types of NT responsible for diverse effects of ANS

  -Acetyl choline: nerves fibres that release Ach are cholinergic fibres

  -receptors binding to ACh are cholinergic receptors e.g nicotinic and muscarinic receptors
• Noradrenaline and effect On ANS

  -nerve fibres that release noradrenaline are adrenergic fibres

  -receptors that bind to noradrenline are adrenergic receptors such as alpha 1+2 and beta 1+2 receptors
• diffferences in somatic and NS

  -somatic: one neuron (motor) to release NT

  -autonomic sympathetic: has a ganglion (where synapse is ) and 2 neurones has shorter pre ganglionic fibre and longer post ganglionic fibre , Ach released by pre ganglionic, releases Noradrenaline at post ganglionic

  -parasympathetic: pre ganglionic fibres longer , post ganglionic fibres are shorter , Ach released at post ganglionic
• norepinephrine

  -is noradrenaline
• epinephrine

  -is Adrenalin
• diagram of parasympathetic and sympathetic

  Nerves in sympathetic derive from thoracic and lumbar regions - have shorter pre gang fibres

  -para: branches from cranial and sacral region

  
• summary of para and sympathetic


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• effects of these divisions on organs 


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• effects on organs 


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