1. Neuron (Nerve Cell) Cell Body Axon Dendrites Cytoplasm Nucleus
Carry messages away from the cell body to other neurons
Dendrites
Carry messages to the cell body

2. Types of Neurons Receptor Cells Receives information from a stimulus
For example - your finger gets hit by a hammer
Sensory Neurons
Carry the impulse to the spinal cord
Travels the length of the arm to the spinal cord
Interneurons
Impulse is transmitted to the brain and the motor neurons via synapses
Travels to the brain to register pain and out to the finger
Motor neurons
Sends the processed information back to finger
Carries impulse to the effector cells in the fingers, hand and arm

3. Nerve Impulses
120 meters per second = speed at which impulses travel in the body.
Synapse – gap between two neurons (axon and dendrite)
Impulse travels from one neuron to the next by sending chemicals across a gap to activate the next neuron.

4. Reflex Arc Hand touches open flame or hot burner
Impulse travels to spinal cord
Impulse sent to brain and back to hand.
Hand pulls back before pain is registered by brain 3. 2. 1. 4.

5. Nervous System Two major divisions Central Nervous System (CNS)
brain and spinal cord
2. Peripheral Nervous
System
motor and sensory neurons

6. Central Nervous System

8. Development of the brain Conception - newborn

9. Sagittal Section of Brain
cerebrum
Corpus callosum
cerebellum
Medulla oblongata
pons

10. Inferior view of Brain Olfactory Lobes Frontal lobe of the cerebrum
cerebellum
Medulla oblongata
Olfactory Lobes
Frontal lobe of the cerebrum

11. Regions of the Brain Cerebrum - thought and reasoning
Frontal - thinking, talking, remembering, moving
Parietal - touching
Occipital - seeing
Temporal – tasting, smelling, hearing
Cerebellum – coordination of muscular movements
Medulla Oblongata – involuntary responses
Pons – band of nerves linking the medulla and the cerebellum
Olfactory – sense of smell

12. Spinal Cord

13. Peripheral Nervous System
Consist of the neurons (receptor and motor) which lead to and from the central nervous system
Two divisions
Sensory Somatic
Autonomic