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Is the cholinergic nicotinic receptor the target receptor for preganglionic neurons?
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What are cholinergic nerves?
The parasympathetic nervous system, which uses acetylcholine almost exclusively to send its messages, is said to be almost entirely cholinergic. Neuromuscular junctions, preganglionic neurons of the sympathetic nervous system, the basal forebrain, and brain stem complexes are also cholinergic.
What do cholinergic neurons secrete?
Cholinergic neurons secrete acetylcholine.
Difference between muscarinic and nicotinic receptors?
1) nicotinic acetyle choline receptors are ligand gated ion channels, where as mucarinic Ach receptors are G-proteins coupled receptors system. 2) nicotine is a agonist/ muscarine( a toxin produced by certain mushrooms) is a agonist. 3) action of nicotine is fast(1-2msec)/action of muscarinic is slow (100-250msec). 4) in case of nicotinic ach receptor, subtypes based on different subunit composition.muscle and neuronal classification/in case of muscarinic receptor at least 5 receptors subtype have been described by molecular cloning. 5) in case of nicotinic receptor agonist effects blocked by tubocuranine/in case of muscarinic receptor agonist effects blocked by atropine. 6) nicotinic receptor found at neuro muscular junction of skeletal muscle, on the post ganglion neurons of the parasympathetic nervous system and on many neurons on the brain(hypothalamus)/muscarinc receptor found at neuromuscular junction of cardiac and smooth muscle as well as on glands and on the post ganglionic neurons of the sympathetic nervous system.
Does the gray rami communicans contain fibers of a preganglionic or postganglionic neurons?
could be preganglionic
Where do Preganglionic neurons develop from?
Neural crest cells
Which division of the nervous system has short preganglionic neurons?
sympathetic
Are preganglionic neurons made up of adrenergic fibers?
yes
When a preganglionic neuron innervates several postganglionic neurons it is called what?
divergence
Which spinal region lacks autonomic preganglionic neurons?
Cervical Region
What neurotranmitters are released by smpathetic and parasympthetic neurons?
The 2 divisions of the autonomic nervous system (sympathetic and parasympathetic) both have 2 areas where neurotransmitter is released. ?They have ganglionic synapses in the periphery wherein neurotransmitter is released and have synapses on the target organs wherein neurotransmitter is released. ?So this means there is preganglionic and postganglionic release of neurotransmitter.Sympathetic preganglionic neurotransmitter is Acetylcholine. ?Acetylcholine affects muscarinic receptors here.Sympathetic postganglionic neurotransmitter is Norepinephrine. ?Norepinephrine affects alpha or beta receptors here. ?Parasympathetic preganglionic neurotransmitter is Acetylcholine. ? Acetylcholine affects muscarinic receptors here.Parasympathetic postganglionic neurotransmitter is Acetylcholine. ?In this case Acetylcholine affects muscarinic receptors.?Sympathetic neurons are considered to be adrenergic & sympathetic neurons are considered to be cholinergic.
How do receptor neurons help people perceive smells?
Receptor neurons in the nostrils first detect an odor by coming into contact with and reacting to gas molecules of the substance. Then the receptor neurons send information about the odor along the olfactory nerve to the brain.
What are the differences between preganglionic and postganglionic neurons?
You have a really good question. Studying the nervous system can be overwhelming and quit confusing. Preganglionic Neurons come from the CNS to the Ganglion ( mass of neuron cell bodies and dendrites) and Postganglionic neurons leave the ganglion and head toward the effector organ ( smooth muscle, glands, etc..).
