1. Nervous system I
Chapter 10

2. Nervous system
Trillions of nerve cells linked together in a highly organized manner to form the rapid control system of the body
Neurons- nerve cells, carry electrical signals rapidly and over long distances

3. Divisions of the nervous system
Central nervous system (CNS)
Brain
Spinal cord
Peripheral nervous system (PNS)
Nerves in other parts of the body
Spinal and cranial nerves

4. Brain
Spinal
cord
Cranial
nerves

5. General functions of the nervous system
Sensory
Gather information
Info carried to CNS
Integrative
Sensory information used to create sensations, memory, thoughts, decisions
Motor
Decisions acted upon
Information carried from CNS to PNS

6. Two broad types of nerve paths

7. Cells of the nervous system
Neuron
Glia

8. Neurons Vary in size and shape Share certain features
Dendrites- receive signal
Cell body- contains nucleus
Axon- transmits signal to another neuron

9. Neuron structure Dendrites Cell body Receive incoming signals
Transfer to cell body of neuron
Cell body
Typical cell structures
cytoskeleton

10. Neuron structure
Axon
Transmits signal to synapse

11. Neuron structure- synapse
Region where axon meets target cell
Space across which neurotransmitter diffuses

12. Myelination of axons
Myelin- lipids and proteins that wrap around an axon
White matter
Contains myelinated neurons
Gray matter
Contains unmyelinated neurons
Dendrite
Node of Ranvier
Myelinated region of axon
Axon
Unmyelinated
region of axon
Neuron
cell body
nucleus

16. http://www. youtube. com/watch