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 mode of termination of right and left posterior intercostals veins

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Difference between mode of termination of right and left posterior intercostals veins 
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Right posterior intercostals veins
Left posterior intercostals veins
1st (highest ) right posterior intercostals vein drains into right brachiocephalic vein
1st (highest ) left posterior intercostals vein drains into right brachiocephalic vein
2nd,3rd , 4th right  posterior intercostals veins join to form right superior intercostals veins which in turn drains into azygos vein
2nd,3rd , 4th left  posterior intercostals veins join to form right superior intercostals veins which in turn drains into left brachiocephalic  vein
5th to 11th right posterior intercostals veins drain into azygos vein
5th to 8th left posterior intercostals veins drain into accessory azygos vein
9th to 11th drain into hemiazygos vein
Right Subcostal vein drain into azygos vein
Left  Subcostal vein drain into the hemiazygos vein

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