Brain + Eyes

• Brain- Medulla


  Responsible for unconscious activities e.g:

  1. Breathing
  2. Heartbeat
• Brain- Cerebral Cortex


  Responsible for conscious thought e.g:

  1. Memory
  2. Language
  3. Intelligence
• Brain- Cerebellum


  Responsible for muscle co-ordination + is important for:

  1. Movement
  2. Posture
  3. Balance
  4. Speech
• Iris

  • Coloured part of the eye
  • Controls the pupil size
  • Controls the amount of light that enters the pupil
• Cornea

  • Refracts light as it enters the eye
  • Transparent outer layer
• Lens

  1. Further bends (refracts) light to focus it onto the retina
  2. Helps see images clearly
• Pupil

  • Light passes through it
  • An opening that allows light through to enter
• Suspensory Ligaments

  • Connects ciliary muscles to the lens
  • Ring of fibres
• Ciliary Muscles 


  1. Changes shape of lens to focus light
  2. Smooth muscle
• Retina


  • Where light hits
  • Contains rods and cones (light receptors)
  • Cones are colour sensitive
  • Rods are sensitive to light
• Optic Nerve 


  Sends signals to the brain (electrical impulses)
• Sclera


  • Protective layer
  • White outer layer
• Object is close

  Ciliary Muscles- Contract (tighten)

  Suspensory Ligaments- Loosen

  Lens thickens
• An object is far away

  Ciliary Muscles- Relaxes

  Suspensory Ligaments- Stretched

  Lens thins