Nervous Tissue. Information Highways Electrical Signals.

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Presentation transcript:

Nervous Tissue

Information Highways

Electrical Signals

1600’s 1818

Signals Movement of charges (ions!)

Densely packed Tightly intertwined

Neurons Nerve cells Excitable Transmit signals Amitotic* Various shapes and sizes Extreme longevity Exceptionally high metabolic rate st_of_animals_by_number_of _neurons st_of_animals_by_number_of _neurons Neuroglia (glia) Supporting cells Smaller in size Undergo mitosis Outnumber neurons Split up into two types: – Scaffolding/insulation – Promoting health/growth

Support Cells of CNS Astrocytes - helps with exchanges between blood capillaries and neurons, forms the blood-brain barrier

Support Cells of CNS Microglia – monitors health, can transform into a microphage*

Support Cells of CNS Ependymal cells – lines central cavities of brain and spinal cord, formation of cerebrospinal fluid, ciliated – help move fluid

Support Cells of CNS Oligodendrocytes – composes myelin sheaths

Support Cells of PNS Satellite cells – function largely unknown Schwann cells – form myelin sheaths, vital to nerve fiber regeneration

Neurons

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