PSYC 106 Lecture Notes - Lecture 2: Myelin, Schwann Cell, Central Nervous System
Document Summary
Glial cells: form the myelin sheath, cns: oligodendrocytes, pns: schwann cells, microglia and astrocytes (cns): remove waste material, dead neurons, radial glia: direct neurons during development. Turnover is much greater for a skin cell than a cell in the ovary. Because there is more damage to skin. Mostly to injury cells breaks down, gets damaged. After development neurons in both dns and pns lose their ability to undergo mitosis after you"re born. Exception: some neurons that do undergo mitosis (adults) Isolated parts of bird, rodent, and primate brain. Eventually if there is enough breakdowns of the cells need to be regenerated. Cannot make new brain cells after brain damage. After brain damage cannot get oxygen and glucose brain cells dies. As we age brain cells shrink and become less functional. Brain cancer: brain cancer is usually glia and not neurons. Glia cells in both cns and pns undergo mitosis. Cells undergo mitosis under a very rapid rate forms a tumor.
