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 granular and agranular cortex

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 Difference between granular and agranular cortex

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  1. Granular Cortex (Koniocortex)
    • Description: it is well-developed layer IV (internal granular layer), rich in neuron , known as small granular (stellate) cells.
    • Function: it is done sensory processing (receives input from the thalamus).
    • Example:
      • Primary somatosensory cortex (Brodmann areas 3, 1, 2).
      • Primary visual cortex (Brodmann area 17).
      • Primary auditory cortex (Brodmann areas 41, 42).
  2. Agranular Cortex
    • Description: it is poorly developed or absent layer IV, contain neuron with large size known as  large pyramidal cells in layer V.
    • Function: it controls motor function  (sends output to spinal cord and brainstem).
    • Example:
      • Primary motor cortex (Brodmann area 4).
      • Premotor cortex (Brodmann area 6).

      • Granular Cortex

        prominent layer IV, small granular cells

        Sensory processing

        primary sensory, visual, auditory cortex

        Agranular Cortex

        thin/absent layer IV, large pyramidal cells in layer V

        Motor control

        Primary motor & premotor cortex

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