PHYSIOLOGY OF ANS :::
The chemical transmitter of the preganglionic fibres is acetylcholine for all the autonomic nerves that is both sympathetic and parasympathetic in post ganglionic fibres the transmitter is noradrenaline in the sympathetic system and in the parasympathetic it is acetylcholine hence sympathetic system is also known as adrenergic system and parasympathetic as cholinergic system
In general organs have dual supply i.e.they are innervated by sympathetic as well as parasymathetic system and both have opposite effects Sympathetic system and both have opposite effects Sympathetic system in general is inhibitory whereas parasympathetic system in general is excitatory in nature Exceptions are the heart and blood vessels where it is quite reverse Although all the organs are supplied with both divisions of ANS there are some exceptions such as oesophagus adrenal medulla gastric glands and lacrimal glands etc that are supplied with only the parasympathetic The organs sweat glands erector pillae arterioles ureters uterus fallopian tubes and seminal vesicles are all supplied only with the sympathetic Sweat glands are an exception that though sympathetic it is cholinnergic in nature
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