1. The Nervous system
Neurons & Neuroglia

2. Two Types of Nervous Cells
Neurons
Nerve cells
Transmit messages
Neuroglia
Supportive cells
Do not transmit messages
Never lose ability to divide
Six types

3. Types of Neuroglia - CNS
Astrocytes
Guide migration of developing neurons
Aid in nutrient exchange
Help form blood-brain barrier
Microglia
Immune cells that act as macrophages for nervous system

4. Types of Neuroglia - CNS
Ependymal cells
Line cavities of CNS
Oligodendrocytes
Produce the myelin sheath around the CNS

5. Types of Neuroglia - PNS
Satellite Cells – Protect & cushion
Schwann Cells
Form myelin sheath
Help with regeneration

6. Neuron Structure Dendrite Cell Body Nodes of Ranvier Axon
Myelin Sheath

7. Myelin Sheath

8. Other Vocabulary Nuclei – clusters of cell bodies in the CNS
Ganglia - clusters of cell bodies in the PNS
Tracts – bundles of axons in the CNS
Nerves - bundles of axons in the PNS

9. Neuron Classification - Structural

10. Neuron Classification - Functional
Sensory (afferent)
Naked nerve endings
Meissner’s corpuscles
Pacinian corpuscles
Proprioceptors
Motor (efferent)
Association (Interneurons)