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 right and left umbilical veins

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Difference between  right and left umbilical veins 
 A right umbilical vein is a relatively common variation (23:10,000) where the right umbilical vein persists instead of obliterating around 6 weeks as a result from enlargement of the liver.
Right umbilical vein
Left umbilical vein
It is degenerate in 7 week of  fetal life
it is degenate at least a week after birth  
It is not continuous with ductus venosus
It is continous with ductus venosus
It carry no blood to fetus
It carry oxygeneted blood to fetus from placenta
It is not produce any adult structure
In adult it is converted into round ligament of liver

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