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 posterior intercostal veins

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Difference between right and left posterior intercostal veins
Right posterior intercostal veins
Drain into
Left posterior intercostal veins
Drain into
1st
Right brachiocephalic vein

1st
Left  brachiocephalic vein

2-4
Superior intercostal vein drain into azygous vein – azygous vein drain into SVC

2-4
Superior intercostal vein drain into left brachiocephalic vein
 5-11
Azygous vein drain into SVC
5-8
Accessory hemi-azygous  vein
12 subcostal vein
Azygous vein drain into SVC
9-12
Hemi-azygous  vein

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