THE
NERVOUS
SYSTEM
• Your body performs many functions that maintain
life, such as heartbeat, temperature, digestion
and blood pressure.
• Th...
• Neurons are nerve cells
• Neurons are made up of dendrites and axons
• Dendrites receive impulses from other neurons
• A...
• There are three types of neurons:
- sensory neurons receive information and send
impulses to the brain and spinal cord
-...
• To move from one neuron to another, an impulse
crosses a small space called a synapse
• The Central Nervous System (CNS) contains the
brain and the spinal cord
• The Peripheral Nervous System (PNS) is made up
of all the nerves outside the CNS, including:
- cranial nerves (in the he...
The BRAIN
• The brain is an organ of soft nervous tissue
which functions as the center of sensation and
intellectual activ...
• The brain coordinates all of your body’s activities
• The brain is protected by the skull, three
membranes, and a layer ...
BRAIN STEM
• The cerebrum is the largest part of the brain.
• It is where thinking takes place, the center of
intellectual activity
• Also in the cerebrum:
- impulses from the senses are interpreted
- memory is stored
- movements are controlled
• The bum...
• The cerebellum is the part of the brain that
controls voluntary muscle movements,
maintains muscle tone and helps mainta...
• The brain stem extends from the cerebrum and
connects the brain to the spinal cord
• The brain stem is made up of the mi...
• The spinal cord is
an extension of the
brain stem
• It is made up of bundles
of neurons that carry
impulses from body pa...
• The spinal cord is protected by bones called
vertebrae
• Injury to the spine can cause paralysis, the loss
of muscle mov...
• In the Peripheral Nervous System (PNS), there
are two divisions:
• The somatic system controls voluntary actions –
movem...
• A reflex is an involuntary response to a stimulus
• A reflex involves a simple nerve pathway called a
reflex arc
• A ref...
• The sensory systems are parts of the nervous
system responsible for processing sensory
information
• Sense organs are sp...
• A sensory system consists of sensory
receptors, neural pathways, and parts of
the brain involved in sensory perception
The nervous system
The nervous system
The nervous system
The nervous system
The nervous system
The nervous system
The nervous system
The nervous system
The nervous system
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The nervous system

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The nervous system

  1. 1. THE NERVOUS SYSTEM
  2. 2. • Your body performs many functions that maintain life, such as heartbeat, temperature, digestion and blood pressure. • The regulation of conditions that maintain life is called homeostasis. • The nervous system is used by your body to maintain homeostasis
  3. 3. • Neurons are nerve cells • Neurons are made up of dendrites and axons • Dendrites receive impulses from other neurons • Axons carry impulses away from the neurons
  4. 4. • There are three types of neurons: - sensory neurons receive information and send impulses to the brain and spinal cord - interneurons in the brain and spinal cord relay impulses to the motor neurons - motor neurons conduct impulses to muscles or glands throughout the body
  5. 5. • To move from one neuron to another, an impulse crosses a small space called a synapse
  6. 6. • The Central Nervous System (CNS) contains the brain and the spinal cord
  7. 7. • The Peripheral Nervous System (PNS) is made up of all the nerves outside the CNS, including: - cranial nerves (in the head) - spinal nerves * The PNS connects the brain and spinal cord to other body parts
  8. 8. The BRAIN • The brain is an organ of soft nervous tissue which functions as the center of sensation and intellectual activity - (that’s your senses and ability to think) 
  9. 9. • The brain coordinates all of your body’s activities • The brain is protected by the skull, three membranes, and a layer of cranial fluid • The brain is divided into three major parts: the cerebrum, the cerebellum, and the brain stem
  10. 10. BRAIN STEM
  11. 11. • The cerebrum is the largest part of the brain. • It is where thinking takes place, the center of intellectual activity
  12. 12. • Also in the cerebrum: - impulses from the senses are interpreted - memory is stored - movements are controlled • The bumpy outer layer of the cerebrum is called the cortex
  13. 13. • The cerebellum is the part of the brain that controls voluntary muscle movements, maintains muscle tone and helps maintain balance
  14. 14. • The brain stem extends from the cerebrum and connects the brain to the spinal cord • The brain stem is made up of the midbrain, the pons, and the medulla
  15. 15. • The spinal cord is an extension of the brain stem • It is made up of bundles of neurons that carry impulses from body parts to the brain, and from the brain to the body parts
  16. 16. • The spinal cord is protected by bones called vertebrae • Injury to the spine can cause paralysis, the loss of muscle movement. • The higher up the spine the injury is, the more of the body that is affected
  17. 17. • In the Peripheral Nervous System (PNS), there are two divisions: • The somatic system controls voluntary actions – movements you choose • The autonomic system controls involuntary actions like heart rate and breathing
  18. 18. • A reflex is an involuntary response to a stimulus • A reflex involves a simple nerve pathway called a reflex arc • A reflex allows the body to react to a potentially dangerous stimulus quickly, without having to think about it (such as heat) • Reflexes are controlled in the spinal cord, not the brain; the brain acts after a reflex (putting on burn cream, for example)
  19. 19. • The sensory systems are parts of the nervous system responsible for processing sensory information • Sense organs are specialized organs that initiate the process of sensory perception • The body’s main sense organs are the eyes, ears, tongue, nose and skin
  20. 20. • A sensory system consists of sensory receptors, neural pathways, and parts of the brain involved in sensory perception

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