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NERVOUS SYSTEM HISTOLOGY (CNS (CEREBELLUM (function (voluntary motor…

- - - - nerve cell bodies
        
        will see cell bodies, not as pointilated
    - - myelinated nerve fiber bundles
        
        looks like a bunch of little pin pricks
    - - afferent, sensory neurons
      - pseudounipolar types
      - SATELLITE CELLS
      - HISTOLOGY
        
        "fried eggs", really they look like boobs
      - Schwann Cells
  - - - Arachnoid
        
        loose connective tissue
        
        CSF flows within
      - Dura Mater
        
        dense, connective tissue
      - Pia Mater
        
        delicate layer of collagen & fibroblast-like cells
    - - flow
        
        lateral ventricles :arrow_right: third ventricle :arrow_right: aqueduct :arrow_right: fourth ventricle :arrow_right: central canal in spinal cord
      - EPENDYMAL CELLS
        
        Ependymal tissue
        
        CHOROID PLEXUS, actually makes CSF
        
        cuboidal or low columnar cells
        
        cilia, to help circulate CSF
        
        single thin layer around ventricles
  - - - voluntary motor movement, balance, equilibriu, & muscle tone
    - - Giri & Sulci
    - - Gray Matter
        
        Granular Layer
        
        small, extend to Molecular layer
        
        Purkinje Layer
        
        single layer, dendrites (like wig looking amount) into Molecular layer, axons into white matter
        
        Molecular Layer
        
        axons & dendrites, surface
    - - just under bulk of brain matter
  - - - Giri
        
        bumps
      - Sulci
        
        infoldings for surface area
    - - Gray matter
        
        cell bodies, dendrites, & glial cells
      - White matter
        
        in/out going axons & glial cells
      - PYRAMIDAL CELLS
        
        80% of neurons in cortex
        
        GLUTAMATE is the major NT/excitatory component
        
        connect w/other neurons in the brain
    - - 6 Layers, I = outtermost
- - - - nerves run along/between layers of muscle
  - - - no cell bodies of neurons
        
        will belong to schwann cells or fibroblasts
    - - ENDONERIUM
        
        single axon
      - PERINERIUM
        
        bundle
      - EPINERIUM
        
        fascicles
- - - - :arrow_down: coordination
      - tremors
      - paralyzation
- - - - Axon
        
        microtubules
        
        axon hillock: sums polarizations
        
        not seen very well in stains
      - Cell Body soma, perikaryon
        
        Nissi Substance = RER
      - Dendrites
        
        unipolar
        
        multipolar
    - - Purkinje cells
      - pyramidal #
        
        look like triangles streaking through the sky
      - Granule
    - - Sensory Neurons
      - Motor Neurons
      - Interneurons
  - - - Oligodendrocyte
        
        myelin
        
        round, little halo around them
      - Astrocytes
        
        blood brain barrier
        
        spider looking, lots of extensions
      - Ependymal Cell
        
        CSF production and circulation
      - Microglia
        
        immune cells
        
        only one made from mesoderm
        
        little slits
    - - Schwann Cells
        
        myelin
        
        phagocytic activity
        
        make room for regrowth of PNS neurons
    - - still divide -> cancers