PSL201Y1 Lecture Notes - Lecture 7: Arachnoid Granulation, Dura Mater, Pia Mater
Document Summary
Central nervous system cns (responsible for what we perceive, do, fell and think): brain and spinal cord. Glial cells 90% of cns composed of glia not as well known as neurons five types of glial cells: astrocyte-numerous functions (looks like stars), ependymal cells-line cavities, microglia- phagocytes, oligodendrocytes-form myelin, schwann cells (located in pns)- form myelin. Glial cells oligodendrocyte and schwann cells are used for myelination astrocytes, their endings are terminating at blood vessels, it is following the blood vessel, astrocytes have latched on to the blood vessel with their feet. Microglia are like soldiers of cns protect cns from foreign matter through phagocytosis: bacteria, dead or injured cells protect cns from oxidative stress. In between arachnoid mater and pia mater, we have subarachnoid space this space is filled with the csf liquid to maintain a suspension, cushion this protects from mechanical stress.
