Sensory System

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Sensory System

• Senses

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Sight

• Occipital lobe of brain
• Light enter eye forms upside down image on Retina
• Retina transforms light into nerve signals
• Brain turns image right side up and tell what we
  are seeing

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Hearing

• Temporal lobe of brain
• Sound waves enter ears causing eardrum to vibrate
• Vibrations transferred to hammer, anvil and
  stirrup in middle ear
• Turned into nerve signals
• Cortex processes signals and tells us what we hear

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Taste

• Parietal lobe of brain
• Taste buds (sensory cells) react to chemicals in
  foods
• Identify sweet, sour, salty and bitter
• Messages sent from taste buds to areas of brain
  responsible for processing taste

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Smell

• Parietal lobe of brain
• Olfactory cells in the mucous membranes lining
  the nostrils react to chemicals
• Messages are sent along specific nerves to the
  brain
• Brain distinguishes between smells

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Touch

• Parietal lobe of the brain
• Skin contains over 4 million sensory receptors
• Receptors gather information and sent it to the
  brain fro processing and reaction

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Cranial Nerves

• 12 pairs
• Bring information from the sense organs to the
  brain
• Control muscles
• Connect to glands and other organs