1. Nervous Tissue Two main cell types Neurons
Support cells (neuroglial cells)

2. Neuroglia (Glia or Supporting Cells)
Function: Support and protect the neurons
Astrocytes

3. Neuroglia
Function: Destroy bacteria through phagocytosis
Microglia

4. Neuroglia Oligodendrocytes
Function: Produce lipid covering called myelin sheath
Oligodendrocytes

5. Schwann Cells & Satellite Cells
Neuroglia
Function: Produce lipid covering called myelin sheath
Schwann Cells & Satellite Cells

6. Neuroglia: Structure

7. Neurons (Nerve Cells)
The human body contains billions of neurons.
Neurons are the basic structural units of the nervous system.

8. Neurons: Function
Conduct electrical impulses along the plasma membrane.

9. Neurons: Special Characteristics
Longevity
Do not divide
High metabolic rate

10. Structure of a Typical Large Neuron

11. Synaptic Terminals (Synaptic Bulbs)

12. Myelin Sheaths and Nodes of Ranvier

13. Two Neurons Communicating at a Synapse

14. Neurotransmitters: Acetylcholine
Controls muscle contractions

15. Neurotransmitters: Norepinephrine
Increases heart rate

16. Neurotransmitters: Dopamine
Associated with “pleasure” system of the brain

17. Neurotransmitters: GABA
Major inhibitory neurotransmitter

18. Neurotransmitters: Serotonin
Involved in inducing sleep, temperature regulation, and control of mood

19. Neuron Function (Action Potentials)