The Nervous System
Nervous system
Jun 25, 2015
Nervous System teaching presentation
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The Nervous System
The Neuron:
Parts:a. Dendrites – receives info from other cells
The Neuron:
Parts:a. Dendritesb. Soma (cell body) – processes the signal/disturbance
and spreads to the trigger zone
The Neuron:
Parts:a. Dendritesb. Soma (cell body)c. Nucleus – contains the DNA
The Neuron:
Parts:a. Dendritesb. Soma (cell body)c. Nucleusd. Myelin Sheath – transmits info efficiently and quickly
The Neuron:
Parts:a. Dendritesb. Soma (cell body)c. Nucleusd. Myelin Sheathe. Axon – transmits messages to another cell
Types of Neuron:
1. Sensory Neuron – obtains signals from outside the body
Types of Neuron:
Types of Neuron:
2. Interneuron – connects neuron to neuron
Types of Neuron:
3. Motor Neuron – carry and transmit signals to muscles, glands and skin
Network of Neurons:
NERVOUS SYSTEM
CENTRAL NERVOUS SYSTEM PERIPHERAL NERVOUS SYSTEM
BRAIN SPINAL CORD MOTOR NEURONS SENSORY NEURONS
AUTONOMIC NERVOUS SYSTEM SOMATIC NERVOUS SYSTEM
SYMPATHETIC PARASYMPATHETIC
The Central Nervous System:
1. Brain – processes all the information received and determines what to do with it
The Central Nervous System:
1. Brain – processes all the information received and determines what to do with it
The Central Nervous System:
1. Brain2. Spinal Cord – information highway
1. Somatic Nervous System – receives messages from the CNS to the skeletal muscles; normally under voluntary control
The Peripheral Nervous System:
The Peripheral Nervous System:
1. Somatic Nervous System2. Autonomic Nervous System – concerned with signals
to and from internal organs and glands
a. Sympathetic – stress, excitement and dangerb. Parasympathetic – relaxed mode
Drugs disrupt signaling:
1. Stimulants – block brain receptors that suppress brain cell activity
Drugs disrupt signaling:
1. Stimulants2. Depressants – stimulates the release of endorphins
causing euphoria then depression
Drugs disrupt signaling:
1. Stimulants2. Depressants3. Analgesics – blocks the transmission of signals
carrying pain messages
Drugs disrupt signaling:
1. Stimulants2. Depressants3. Analgesics4. Hallucinogens – destroy sensory perceptions and
bring on dreamlike state
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