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Astro (Greek) - Star
3 terms share this root

A "Star"shaped "cell" of the brain.

  • Astro (Greek) - Star
  • Cytos (Greek) - Cell, A Hollow, Receptacle, Vessel
  • Glial cells that support neurons of the brain and spinal cord
  • They are the most abundant cell of the human brain
  • Functions include physical support, repair, potassium metabolism, removal of excess neurotransmitter, part of blood brain barrier
  • Contributes to glial scar
  • Marker: GFAP
  • Derived from neuroectoderm.
  • Nocardia asteroides

    A bacteria med for both the French veterinarian who described it, and for the "star" like colonies it forms on agar.

    • Astro (Greek) - Star
    • Eidos (Greek) - Form, Resemblance or Shape, Likeness
  • Gram positive
  • Catalase positive
  • Acidfast branching filaments
  • Obligate aerobe
  • May cause pulmonary infections in immunocompromised individuals
  • Treated with sulfonamides

  • Mnemonics
    Urease Positive Organisms
    Proteus, Ureaplasma, Nocardia, Cryptococccus, H. Pylori
    Pilocytic astrocytoma

    A brain "mass, tumor" derived from astrocytes ("star" shaped glial cell in CNS)

    • Pilus (Latin) - Hair
    • Astro (Greek) - Star
    • Cytos (Greek) - Cell, A Hollow, Receptacle, Vessel
    • Oma (Greek) - Morbid growth, mass, tumor
  • A childhood cystic neoplasm
  • Often in the cerebellum
  • Composed of bipolar cells with "hair like" GFAPpositive processes
  • Associated with Rosenthal fibers, which can be seen under microscopy