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Nervous System

Peripheral Nervous

System

Automatic Nervous

System

Somatic Nervous

System

Central Nervous

System

Cerebrum

Cerebellum

Brain stem

Spinal cord

Nervous System

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Cerebrum

Cerebellum Brain Stem

Spinal Cord

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Central Nervous System - C . N . S

Cerebrum

• Two Hemispheres

• Cross control

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Cerebrum

Functions of the different lobes

Parietal Frontal Temporal Occipital

1. sensors

touch

Pressure

heat/ cold

2. movements

1. Movement

(cross)

2. Learning,

thinking,

feeling

3. Personality

1. Hearing

2. Verbal

Visual system

1.

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Cerebellum Brain Stem Spinal Cord

1.Balance

2.Coordination

3.Fine motor skills

4.Muscle Tension “Tonus”

1.Respiratory Center

2.Control of BP and Heart

Rate

3.Regulates the level of

Glucose in the blood

4.Regulates body heat

5.Vision Reflex (pupil

contraction)

6.Feelings: Hunger, Scent,

Thirst, Appetite,

Satisfaction (food),

Alertness

7.Control over the internal

excretory system

1.Genetic Reflexes

2.Stimulates the peripheral

nervous system.

3. The Spinal Cord leaves

through the Foreman

Magnum

More of the CNS

Peripheral nervous system

Autonomic Nervous System

Sympathetic System

Fight or Flight

Emergency Situations

Parasympathetic System

Feed or Breed

Calm Situations

The effect of the Autonomic Nervous System on the body

Parasympathetic Sympathetic Organ

Decreased Rate Increased Rate and

contractility Heart

Constriction of the Bronchioles Dilation of the Bronchioles Lungs

Works On hold (closed sphincter) Digestive System

Empties the Bladder On hold (closed sphincter) Urinary Tract

Constricts Dilate Pupils

Makes Saliva On hold Salivary Glands

Autonomic Nervous System

Autonomic Nervous System-The Vagus nerve

The main nerves of the parasympathetic system are

the tenth cranial nerves, the Vagus nerves. They

originate in the medulla oblongata

The Transmission of Stimuli in the Nerves

The transmission of Stimuli in the Neuron:

• From the Dendrite to the Axon is an electrical

transmission.

• Between two neurons, in the synapse is a chemical

transmission.

Direction of

Transmission

Dendrite Cell body Axon

Synapse

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The Transmission of Stimuli in the Nerves

There are two main

neurotransmitters in

the nervous system

– Parasympathetic System- Acetylcholine (ACH)

– Sympathetic System-Noradrenaline / Norepinephrine

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