Transcript Document

29.4 Central and Peripheral Nervous Systems
KEY CONCEPT
The central nervous system interprets information,
and the peripheral nervous system gathers and
transmits information.
29.4 Central and Peripheral Nervous Systems
The nervous system’s two parts work together.
• The CNS includes the brain, brain stem, and spinal cord.
• The PNS includes four systems of nerves.
29.4 Central and Peripheral Nervous Systems
• The CNS and PNS pass signals between one another.
1. PNS stimulates a response.
2. PNS passes impulse to CNS.
3. CNS interprets impulse.
4. CNS passes impulse to PNS.
5. Sensory receptor generates impulse
29.4 Central and Peripheral Nervous Systems
The CNS processes information.
• The brain has three parts.
– cerebrum controls
thought, movement,
emotion
- Details: is biggest part of
brain, what you think of
when you see a brain
– cerebellum allows for
balance
- Details: at base of brain,
looks like cauliflower
– brain stem controls
basic life functions
– Details: has midbrain,
pons and medulla at
top of spinal cord
Brain
stem
midbrain
pons
medulla
oblongata
29.4 Central and Peripheral Nervous Systems
• The brain stem has three parts.
– midbrain controls some
reflexes
– pons regulates breathing
– medulla oblongata controls
heart function, swallowing,
coughing
midbrain
pons
medulla
oblongata
29.4 Central and Peripheral Nervous Systems
• The spinal cord controls reflexes.
– sensory neuron sends impulse to spinal cord
– spinal cord directs impulse to motor neuron
– does not involve the brain
interneuron
motor neurons
sensory neuron
29.4 Central and Peripheral Nervous Systems
The PNS links the CNS to muscles and other organs.
• 1. The somatic nervous system regulates voluntary
movements
– Details: your moving and motor neurons
• 2. autonomic nervous system
controls involuntary, functions
Details: breaks into
sympathetic/parasympathetic
3. sympathetic nervous
system: “fight vs. flight”
-Details: adrenal gland
4. parasympathetic nervous
system: calms the body,
-Details: conserves energy , body at rest…