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 microfilament, intermediate filaments and microtubule

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Topics
Microfilament
Intermediate filaments
Microtubules
Features
Thin, flexible filaments
Strong, stable structures
Exhibit dynamic instability
Shape
Double stranded linear helical array
Ropelike fibers
Non-branching long hollow cylinders
Protein
G-actin
Different types of proteins
Dimmers of α tubulin and β tubulin
Enzymatic activity
ATP hydrolytic activity
None
GTP hydrolytic activity
Polarity
Yes, both end grow 
No
Yes one growing end and other non-growing  end 
Source of energy required for assembly
ATP
N/A
GTP
Location in cell
Terminal web, core of microvilli, concentrated beneath the plasma membrane , contractile elements of muscles
Extend across cytoplasm connecting desmosomes and hemidesmosomes , in the nucleus just beneath inner nuclear membrane 
Core of cilia, mitotic spindle, centrosome
Function
Provide essential components to contractile elements of muscle cells
Provide mechanical strength and resistance to shearing forces
Provide movement for cilia and for chromosomes during cell division

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