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 arrangement of structures in the root of the right and left lung at the hilum

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Difference between arrangement of structures in the root of the right and left lung at the hilum 
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Relations
Right lung
Left lung
From before backwards
1.       Upper right pulmonary vein
2.       Pulmonary artery
3.       Epiarterial & hypoarterial bronchus and lower right pulmonary veins
1.       Upper left pulmonary vein
2.       Pulmonary artery , left principal bronchus , lower left pulmonary vein
From above downwards
Eparterial bronchus
Pulmonary artery
Hyparterial bronchus
Inferior pulmonary vein
Pulmonary artery
Left principal  bronchus
Inferior pulmonary vein

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