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 collagen, reticular and elastic fibre

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Difference between collagen,  reticular and elastic fibre

Features
Collagen fibre
Reticular fibre
Elastin fibre
Appearance
Colourless hence called white collagen fibre
Only demonstrated by special silver techniques hence called argyrophilic fibres . by taking up silver salt . it become back
Yellow
Distribution
Widely distributed  particularly in tendons, joint capsules  and ligaments
Lymphatic system,  basement membrane
Blood vessels , lungs elastic ligament of vocal cord
Structure
They run in bundles in straight or sinus course  a bundle of the fibres branched but an individual fiber do not branch fibrils present
The individual fibers branch and form a network of fiber . fibrils present
The individual fibers branch and form a network of fibre. No fibrils
Consistency
In fresh state soft
Hard
Hard
Flexibility
Fresh state it is flexible
Slight flexible
Slight flexible
Elasticity
Relatively inelastic
Relatively elastic
Relatively elastic
Tensile strength
High
Little
Little
Extensibility
Relatively inextensible
Relatively extensible
Relatively extensible
Transparency
Transparent
Opaque
Opaque
Staining
Eosinophilic  pink
take up silver salt and become black
No

Boiling
It is converted into gelatin
Resistant
Resistant
Chemical composition
Protein collagen
Similar to collagen
Protein elastin and some glycoprotein
Pepsin digestion
Rapid
Slow
Resistant
Dilution with acid or alkali
The fibres swell and disintegrate into fibrillar units of tropocollagen
Resistant
Resistant
Formation
From fibroblast
From fibroblast and reticular cell
Fibroblast fibres and sheath of elastin, can also be formed by smooth muscle cells

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