what are the 3 parts of the nervous system? · 2018. 3. 23. · mar 13 8:41 pm. there are three...

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Nervous System

Nerve CellsReceptors Effectors

Receptor-organs or cells thatdetect stimuli and

convert the stimulito impulses.

What are the 3 parts of the NERVOUS SYSTEM?

Effector A structure thatresponse to a stimulus[Example: Muscle& Gland]

carries

out the

Neuron

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Sense organs and receptorsThe five sense organs:

1)____________

2)____________

3)____________

4)____________

5)_____________

Ear [cochlea][mechanoreceptor

Mouth [tastebuds][Chemoreceptors]

Eyes [Retina][Photoreceptor]

Skin [thermo­Receptors

Pressure ReceptorsPain Receptorshttps://www.youtube.com/watch?v=E4Ep1atfFlg

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Effectors: muscles or glands that respond to nervous impulses

Stimulus (light)

Receptor(cells in the eye)

Effector

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There are three types of neurons1)Sensory Neuron­carries impulses from the sense organs to the spinal cord or brain. (CNS)

2) Motor Neuron­carries impulses from the brain and spinal cord to muscles and glands(effectors)

3) Interneurons­connect sensory and motor neurons and carry impulses between them. Most are located in the brain and spinal cord(CNS)

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What is a nerve?

A bundle ofneurons surrounded

by connective tissue

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Human Nervous System

Central Nervous         System  Peripheral Nervous

          Systemconsists of

The Brain and Spinal Cord

consists ofAll nerves outside the CNS. Sensory and Motor NeuronsAll Nerves that comeoff the brain &spinal cord

-Nerves coming offthe brain

nerves

-Nerves coming offthe spinal cord

-spinal nerves

-cranial

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What are the 2 DIVISIONS of the Nervous System ?

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What protects the brain?Central Nervous System

l. Skull2. Meninges

3. Cerebrospinalfluid

-bone

membranes that

protect the brain

fluid surrounding

brain &sp. cord

that protects & nourishes

the brain

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Cerebrum

Cerebellum

Medulla Oblongata

Brain

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Cerebrum: • the largest part of the brain. • Center for thinking, memory and voluntary activities, and senses

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Cerebellum: • coordinates motor activities •  helps maintain balance

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Medulla Oblongata:controls many involuntary activities including breathing, heartbeat, and blood pressure

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hypothalamus- Link between the nervous and endocrine system-helps regulate body Temperature-It helps to regulate appetite, thirst

Blood pressure, sleep, and emotions

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Thalamus

consciousness, sleep, and sensory interpretation.

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What protects the spinal cord?

Spinal Cord 1) vertebrae (bones)

2) meninges (membranes)

3) Cerebrospinal fluid.

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Spinal Cord: A Thick nerve  a) It carries nerve impulses between the brain and other structures of the body.

b) controls certain reflexes (automatic responses to stimuli)

Attachments

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