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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Histological features of osteoblast

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Histological features of osteoblast




Size  : 15-30 µm
•      Cuboidal, low columnar or polygonal ,
•      arranged in single layer,
•      eccentrically placed oval single nuclei
•      cytoplasm is basophilic leaving a clear area due to golgi complex,
•      Ultra structurally they have features typical of protein secreting cells
•      Cytoplasm contain abundant rER and free ribosomes
•      Cell membrane of osteoblast has processes which communicate with the adjucent osteoblasts and with osteocytes by gap junctions

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