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Peripheral nervous system (PNS)
Everything outside The brain & spinal cord that represents the input & output pathways
Autonomic nervous system
Controls smooth & cardiac muscle in your organs & glands. Involuntary movement
Also known as glial cells are specialized cells in nervous tissue that allow it to perform nervous system functions. In CNS there are 4 types of glial cells
Negatively charged again. Potassium is positively charged and leaves the cell and tAkes its positive cells. Becoming more negatively charged so cell returns back to rest
Once action potential is formed, it travels down the axon from the cell body to the terminal
Lipid insulation or sheath formed by oligodendrocytes in CNS &schwann in PNS. myelinated cells look white. Unmyelinated cells look gray. Myelin prevent ions from passing thru channels b/c ions are water soluble myelin is lipid
Action potential can only flow down axon by depolarizing each and every cell(slow process)
Multiple sclerosis (MS)
Disorder where myelin in CNS is destroyed. Areas w/out myelin, impulse conduction is slow or impossible. Areas of damaged myelin can have plaques or scarred areas. Cause is propably auto-immune attack. Symptoms including problems with vision, balance , speech, and movement. Most likely in women and people under 50
Relapsing-remitting symptomatic flare-ups( relapse), then period of time where patient has no symptoms(remission)
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