rubensssss
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ANS
CNS---effernt pathway inervate and regulate :
smooth muscle ,cardiac muscle and glands.
Somatic nervous system inervate Skeletal muscle.
What are the three divisions:
easy guys.
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| mjl1717
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Im not sure if I understand the q.
ARe you looking for GVE, GSE and SVE?
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| rubensssss
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Sympathetic,parasympathetic and enteric.
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| rubensssss
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Organization of ANS
Synapses between neurons are made in Autonomic ganglia.
Which ganglia are located in or near the effector organs?
Which ganglia are located in parevertebral chain?
.
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| mani
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parasymp in the viscera and symp in paravertebral chain
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| rubensssss
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Preganglionic neurons have their cells bodies in the cns and synapse in autonomic ganglia.
Questions:
In what spinal cord segments preganglionic neurons of the SNS originate?
Preganglionic neurons of the PNS originate in:
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Mani
thanks for you exelent response.
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| mani
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T1-L2 for symp and S2-4 for parasymp
u r welcome
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| rubensssss
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Yes.
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| juanma0T
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U forgot nuclei of cranial nerves for PNS and BRS Physiology states it's T1-L3
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| mjl1717
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Putting it together:
Parasympathetic (cranial sacral) long preganglionic short postganglionic
the ganglion is near the effector organ eg the vagus
Sympathetic (thoracolumbar) short preganglionic long postganlionic
the ganglion is near at the sympathetic chain eg cervical ganglion
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| mani
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"juanma0T" wrote:
U forgot nuclei of cranial nerves for PNS and BRS Physiology states it's T1-L3
there is differnece about it, i will follow what i was told during graduation
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| rubensssss
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Manni what you mean?
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i meant that there r differece about termination of symp origin at L2/L3. i stick with L2
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| rubensssss
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juanmaOt what saying about the Cranial nerves and spinal cord segment S2-S4 , cranial sacral region, is what I think.Well back to the subject:
Postganglionic neurons have the cell bodies in the autonomic ganglia and synapse on effector organs
EX heart,blood vessel, sweat glands.
adrenal medula is a specialized ganglion of the SNS
Where preganglionic fibers synapse in adrenal medula? They also secret epinephrine and NE.
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| mani
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preganglionic fibres in adrenal medulla secrete ACh
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| mjl1717
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Addendum:
The Craniosacral nervous system is associated with CN III,VII,IX, and X
and S2,S3,S4. The end organ GANGLION in the head for example are:
Ciliary, Pterygopalatine,Otic and submandibular.
By the way I agree with Mani-The thoracolumbar nervous system is between T1 and L2.(BRS review book???) All postganglionic axons are unmyelinated. Because the cervical cord contains no nuclei from which
sympathetic fibers originate, preganglionic fibers of the upper four to five
thoracic segments spread rostrally within the paravertebral trunk to three ganglia in the cervical segments of the trunk. These are the superior, middle, and inferior cervical ganglion. The last one is aso called the stellate ganglion.
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| rubensssss
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The answer is this:
Adrenal medulla is a specialized ganglion of the SNS.
Preganglionic fibers synapse directly on Chromaffin cells in the adrenal medulla.
The chromaffin cells secret Epinephrine 80% and norepinephrine 20% into the circulation.
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| rubensssss
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mjl1717 and mani
what juanmaOT said is about the Craniosacral region that mani forgot to mention.and in my book is T1-L3.
Preganglionic neurons of the PNS originate nuclei of cranial nerves and in the spinal cord segments S2-S4.
And for Preganglionic neurons of the SNS originate in spinal cord segments T1_L3 or thoracolumbar region.(Book of BRS Physiology)
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| rubensssss
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Book james D.Fix
second edition HY neuroanatomy.
Lippincott Williams and Wilkins.
Page 99 Figure 18-1 said
The sympathetic(thoracolumbar) innervation of the ANS.The entire sympathetic innervation of the head is through the superior cervical ganglion. Gray communicating rami are found at all spinal cord levels.White communicating rami are found only in spinal segment T1 through L3.
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Neurotransmitters of the ANS are Adrenergic neurons , Cholinergic neurons and peptidergic neurons.
Q
Adrenergic neurons whether in SNS or PNS release a neurotransmitter,Which is.......
Cholinergic Neurons whether in the SNS or PNS release a neurotransmitter, Which is......
Peptidergic neurons in the PNS release peptides such as........
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| mani
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Adrenergic neurons whether in SNS or PNS release a neurotransmitter,Which is....... norepi
Cholinergic Neurons whether in the SNS or PNS release a neurotransmitter, Which is...... ACh
Peptidergic neurons in the PNS release peptides such as..enkephalins?? (not sures released in PNS or not)
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| rubensssss
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Thanks mani
Peptidergic neurons in the pns release peptides such as VIP and substance P.
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| rubensssss
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Receptor types in ANS :
Adrenergic receptors wich are alpha 1, alpha2,betha 1,betha 2.
Cholinergic receptors:
Nicotinic receptors and muscarinic receptors.
Adrenergic receptors
Alpha 1 receptors;
are located on vascular smooth muscle of the skin and splanchnic region, the GI and bladder sphincters, and radial muscle of IRIS.
Q
they produce exitation or inhibition?
Can you tell me the mechanism of action?
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| mani
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excitation.
Gq prot linked----. increased i/cellular Ca+2
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