different between sympathetic nerves and parasympathetic nerves
Dear student,
Sympathetic nervous system -
It has paired chains of ganglia and other visceral ganglia.
Its preganglionic fibres are shorter than the postganglionic fibres.
Its preganglionic fibres originate from the spinal cord.
Each preganglionic fibre forms synapses with many postganglionic fibres, so many organs are affected.
Its postganglionic fibres are adrenergic i.e., release the neurotransmitter noradrenaline.
It stimulates the medulla of the adrenal glands to release epinephrine and norepinephrine.
Parasymphathetic nervous system -
Chains of ganglia are absent. It has ganglia very close to the organ supplied.
Its preganglionic fibres originate from the brain and spinal cord.
Its preganglionic fibres are much longer than postganglionic fibres.
Each preganglionic fibre synapses with only a few postganglionic fibres, thus, only one organ may be affected.
Its postganglionic fibres are cholinergic i.e., release the neurotransmitter acetylcholine.
Regards.
Dear student,
Sympathetic nervous system -
It has paired chains of ganglia and other visceral ganglia.
Its preganglionic fibres are shorter than the postganglionic fibres.
Its preganglionic fibres originate from the spinal cord.
Each preganglionic fibre forms synapses with many postganglionic fibres, so many organs are affected.
Its postganglionic fibres are adrenergic i.e., release the neurotransmitter noradrenaline.
It stimulates the medulla of the adrenal glands to release epinephrine and norepinephrine.
Parasymphathetic nervous system -
Chains of ganglia are absent. It has ganglia very close to the organ supplied.
Its preganglionic fibres originate from the brain and spinal cord.
Its preganglionic fibres are much longer than postganglionic fibres.
Each preganglionic fibre synapses with only a few postganglionic fibres, thus, only one organ may be affected.
Its postganglionic fibres are cholinergic i.e., release the neurotransmitter acetylcholine.
Regards.
