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 vein and venous sinus

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Difference between vein and venous sinus
Vein
Venous sinus
From within outward it is formed by tunica intima (endothelium, subendothelial connective tissue , and internal elastic lamina ) tunica media and tunic a adventitia
From within outward it is formed by endothelium,  dura mater (dense collagenous connective tissue) & periosteum
Most of the veins contain valves
They are valve less
They contain muscular coat (tunica media )
They are devoid of muscular coat
They collect deoxygenated blood from whole body
They collect deoxygenated blood from the brain , meninges, diploie , internal ear and orbit
They  drain blood into right atrium of heart
They drain blood into internal jugular vein
It contain deoxygenated blood
It contain deoxygenated blood and cerebrospinal fluid
Smooth muscles of blood vessel developed from mesoderm except smooth muscles of head and neck region which derived from neural crest
Cranial dura is developed from neural crest
SN:
Dural venous sinus is  situated in between endosteal and meningeal dura and some
are situated within the infolding of meningeal layer
By emissary vein it is connected with veins of the skull


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Unknown said…
Important information
September 16, 2019 at 7:50 AM
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