KINESIOL 1A03 Lecture Notes - Lecture 4: Central Nervous System, Choroid Plexus, Pia Mater

• School: McMaster University
• Department: Kinesiology
• Course: KINESIOL 1A03
• Professor: Dr.Howard

Document Summary

Supporting cells of the central nervous system (4 in total: neuroglia. Numerous (account for >50% of the weigh of the brain) Has cytoplasmic extensions branch to form foot processes (provide protection) Cover the surface of blood vessels, neurons pia mater. Release chemicals to form tight junctions between endothelial cells of capillaries, create blood brain barrier. Blood brain barrier: protect against toxic substances: ependymal cells. Lines the ventricles of the brain and central canal of the spinal cord. Helps form the choroid plexus (produces csf) Patches contain cilia (help move csf through ventricles: microglia. Dying tissue, microorganisms, foreign substances that invade the cns: oligodendrocytes. Form myelin sheaths: around portions of several axons. Supporting cells of the peripheral nervous system: schwann cells. Forms myelin sheath around a portion of only one axon: satellite cells. Myelin: protects and insulates axons from one another. Unmyelinated axons: only raping around cell one single time, little bit protection, can have multiply axons , conduct more slowly.