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 in adult and in older age

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Difference between thoracic cage in adult and in  older age 

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Thoracic cage in adult
Thoracic cage in older age
Kidney shaped
Barrel shaped
Ribs obliquely placed
More horizontally placed
Transverse diameter can be increased by thoracic breathing but respiration is thoraco-abdominal
Transverse diameter can be increased by thoracic breathing but respiration is thoraco-abdominal
No Unossified sternebrae, unit and formed single segment
Lower end curve inward
Menubriosternal angulation is  promeinent
Menubriosternal angulation is  more promeinent
Well developed kyphotic curvature present in vertebral column
Exaggerated kyphotic curvature

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