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Central Nervous System
Health
Mrs. Wagner
Neurons
• Carry nerve messages or impulses from one
part of the body to another (NC)
• 3 Parts
• 1. Cell Body – controls cell growth
• 2. Dendrite – carry nerve impulses to cell body
• 3. Axon – carries impulses away
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3 Types of Neurons
1. Sensory – external/internal environment
2. Motor – muscles and glands
3. Inter-neurons – brain and spinal cord
Nerve Impulse
• Dendrites stimulated
impulse travels
to cell body
away from cell body on
axon
cross synapse
Central Nervous System
• 2 Parts
• 1. Central Nervous System – brain and spinal
cord
• 2. Peripheral Nervous System – nerves that
connect brain and spinal cord
Brain
• 2 ¼ - 3 ¼ lbs.
• Controls sense experiences, actions, thoughts
and memory
• 2 Hemispheres – right and left
3 Areas of the brain
• 1. Cerebrum – contains specialized regions –
85% brains weight – cross wired L-R and R-L
(NC)
- Frontal Lobe – middle of forehead to middle
of head – moves arms & legs, judgment, logic,
problem solving and planning (NC)
- Parietal Lobe – middle lobe – sensory,
images, touch, pressure, pain, temperature
(NC)
- Occipital Lobe – back of head – vision and
reading ability (NC)
- Temporal Lobe – Above ears, U-Shaped,
hearing and memory, complex sensory
patterns (dance interpretation) (NC)
• 2. Cerebellum – coordination of muscle
activity: Walking (balance, movement of legs,
vision) – not cross wired R-R, L-L
• 3. Brain stem – controls heartbeat, breathing
and blood pressure and reflexes (NC)
Spinal Cord
• Contains meninges and cerebrospinal fluid.
Nerve impulses travel from brain, down the
spinal cord and out of the body – same back
up (NC)
Peripheral Nervous System
• Somatic – all nerves that are not the CNS (NC)
• Autonomic – Internal organs (NC)