BIO 12 Lecture Notes - Lecture 12: Meninges, Schwann Cell, Glycogen
Document Summary
5 types of glial cells: astrocytes numerous functions, ependymal cells line cavities, microglia phagocytes, oligodendrocytes form myelin, schwann cells form myelin. Development of connections between nervous and non-nervous tissue. Remove neurotransmitters (e. g. , glutamate) from synaptic clef: high glutamate toxic. Maintain normal electrolyte composition of interstitial fluid in cns, especially k+ Protect neurons against toxic substances and oxidative stress. Function with astrocytes to protect neurons from toxic substances. Protect the cns from foreign matter through phagocytosis: bacteria, dead or injured cells. Arachnoid mater (under the dura mater and is fragile) Pia mater (lies ontop of brain and is delicate) Secreted by ependymal cells (blood cells) of the choroid plexus. Does not want the csf to be stale, and will be circulated and dumped back into circulation (cleansing and protection) Accounts for 2% of the total body weight: receives 15% of blood supply.
