Nervous system

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