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 thoracic cage of infant and older age

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Difference between thoracic cage of infant and older age 

Thoracic cage in infant
Thoracic cage in older age
Circular in shaped
Barrel shaped
Ribs horizontally placed
More horizontally placed
Transverse diameter cannot be increased by thoracic breathing but respiration is purely abdominal
Transverse diameter can be increased by thoracic breathing but respiration is thoraco-abdominal
Unossified sternebrae are present
Lower end curve inward
Menubriosternal angulation is less promeinent
Menubriosternal angulation is  more promeinent
shallow kyphotic curvature present in vertebral column
Exaggerated kyphotic curvature



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