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Chapter 14 The Human Eye Lesson 1 - Anatomy of the Human Eye
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Chapter 14 The Human Eye Lesson 1 - Anatomy of the Human Eye

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Chapter 14 The Human Eye Lesson 1 - Anatomy of the Human Eye Chapter 14 The Human Eye Lesson 1 - Anatomy of the Human Eye Presentation Transcript

  • Animal receptor organs Chapter 14
  • Sense organs
    • Detect changes in surroundings  make proper adjustments  increase chances of survival
    • Receptors  receive stimuli  inform body of changes in environment
    • e.g. dendrites of receptor neurons, eye, ear
  • Mammalian eye
    • lies within orbit (depression in skull)
    • attached by 6 rectus muscles  involved in rotating eyeball
  •  
  • Labeling eye exterior
  • Labeling eye exterior iris pupil sclera
    • circular, disc-shaped structure with round hole (pupil) in the centre
    • colour varies
    • tough, white, fibrous coat
    • white of eye
    • protective layer around eyeball
    • size changes
    • regulates light entering (protect inner layer from damage)
  •  
    • thin transparent membrane; lubricated by tears secreted by lachrymal gland
    eyelid
    • 1) controls amt. of light entering ( squinting on sunny days)
    • 2) protection ( blinking wipes off dust particles; spreads tears over eyeball; prevent drying up of conjunctiva)
    eyelashes - shields eye from dust particles
  • - secretes tears
    • tears flow out btw eyelids and exposed part of eyeball, reducing friction when eyelids move
    • dust particles entering eye cause greater production of tears which wash them away
    - drains excess tears
  • Labeling eye interior
    • small bulge in front of eye (continuous with sclera)
    • transparent allows light to enter eye
    • denser medium c.f. air
    • light rays refracted inwards toward pupil and lens (greatest light refraction)
  • Lens
    • Transparent, biconvex , crystalline lens
    • Edge attached to ciliary body by suspensory ligaments
    • Ciliary muscles (involuntary circular muscles) involved in focusing / * accommodation*
    • Curvature altered by action of ciliary muscles (elastic lens)
    • Changes in curvature alter focal length of lens so enabling clear images of objects at varying distances to be formed on the retina
  • - contains ciliary muscle; alter thickness of lens Suspensory ligaments
  •  
    • Iight sensitive
    • layer on which images are formed
  • Eye anatomy summary
  • Choroid Retina Blood vessels Optic nerve Fovea centralis Vitreous humour Sclera Suspensory ligaments Iris Pupil Cornea Aqueous humour Lens Ciliary muscle Structure of the eye Rectus muscle Blind spot
  • Activity (labeling the eye)
  • 1 2 3 4 5 6 7 8 9 10 11 ___12____ sclera
  •  
  • Test Yourself Labeling of the eye
  • 1 2 3 4 5 6 7 8 9 10 11
  •