Comparison between tract and nerve

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  Comparison between tract and nerve Nerve Nerve contain bundle of axons (nerve fibers) in the peripheral nervous system (PNS) that transmits signals between the central nervous system (CNS) and other parts of the body. It is the most important part of peripheral nervous system Location: Peripheral nervous system. Structure: Made of axons, connective tissue layers (endoneurium: axon is surrounded by it , perineurium: bundle of axons are surrounded by it, epineurium: whole nerve trunk is surrounded by it), and blood vessels. It gets myelination by Schwann cell   Function: Carries sensory signals to the CNS (afferent) from peripheral part of body or motor signals carry from from the CNS (efferent) to target organs like skeletal muscle, cardiac muscle, smooth muscle or glands Example: Sciatic nerve, median nerve, except optic nerve (though optic nerve is technically part of CNS in develop...
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Difference between greater, lesser and least splanchnic nerve

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Difference between greater, lesser and least splanchnic nerve 

Name
Location of preganglionic neuron
Sympathetic ganglion
Collateral Ganglion
Form autonomic Plexus
Functions
Greater splanchnic nerve
Lateral horn of gray matter of Thoracic 5-9 spinal cord segment
Thoracic
5-9
Synapse with
celiac ganglion
Celiac plexus
 The fibers in this nerve modulate the activity
 of the enteric nervous system of the foregut.
They also provide the sympathetic innervation
to the adrenal medulla, stimulating
catecholamine release.
Lesser splanchnic nerve
Lateral horn of gray matter of Thoracic 10-11 spinal cord segment
Thoracic
 10-11
Synapse with
 aortico-renal ganglion or superior mesenteric ganglion
Renal plexus
The nerve modulates the activity of the enteric
nervous system of the midgut
least or lowest splanchnic nerve
Lateral horn of gray matter of Thoracic 12 spinal cord segment
Thoracic 12
Synapse with
 aortico-renal ganglion
Renal plexus 
 Renal plexus enters the kidneys on
arterial branches to supply the vessels,
Renal glomerulus, and tubules
 

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