nervous tissue. information highways electrical signals

Nervous Tissue

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Nervous Tissue

Information Highways

Electrical Signals

1600’s 1818

1818

Signals

• Movement of charges (ions!)

• Densely packed• Tightly intertwined

Page 7: Nervous Tissue. Information Highways Electrical Signals

Neurons• Nerve cells• Excitable • Transmit signals• Amitotic*• Various shapes and sizes• Extreme longevity• Exceptionally high metabolic

rate• http://

en.wikipedia.org/wiki/List_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

http://en.wikipedia.org/wiki/List_of_animals_by_number_of_neurons

Page 8: Nervous Tissue. Information Highways Electrical Signals

Support Cells of CNS

• Astrocytes - helps with exchanges between blood capillaries and neurons, forms the blood-brain barrier

Page 9: Nervous Tissue. Information Highways Electrical Signals

Support Cells of CNS

• Microglia – monitors health, can transform into a microphage*

Page 10: Nervous Tissue. Information Highways Electrical Signals

Support Cells of CNS

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

Page 11: Nervous Tissue. Information Highways Electrical Signals

Support Cells of CNS

• Oligodendrocytes – composes myelin sheaths

Page 12: Nervous Tissue. Information Highways Electrical Signals

Support Cells of PNS

• Satellite cells – function largely unknown• Schwann cells – form myelin sheaths, vital to

nerve fiber regeneration

Page 13: Nervous Tissue. Information Highways Electrical Signals

Neurons

Page 14: Nervous Tissue. Information Highways Electrical Signals

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nervous tissue. information highways electrical signals

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