Animal receptor organs Chapter 14
Sense organs <ul><li>Detect changes in surroundings    make proper adjustments    increase chances of survival </li></ul...
Mammalian eye <ul><li>lies within orbit (depression in skull) </li></ul><ul><li>attached by 6  rectus  muscles    involve...
 
Labeling eye exterior
Labeling eye exterior iris pupil sclera <ul><li>circular, disc-shaped structure with round hole (pupil) in the centre </li...
 
<ul><li>thin transparent membrane; lubricated by tears secreted by lachrymal gland </li></ul>eyelid <ul><li>1) controls am...
- secretes tears <ul><li>tears flow out btw eyelids and exposed part of eyeball,  reducing friction when eyelids move </li...
Labeling eye interior
<ul><li>small bulge in front of eye (continuous with sclera) </li></ul><ul><li>transparent allows light to enter eye </li>...
Lens <ul><li>Transparent,  biconvex , crystalline lens </li></ul><ul><li>Edge attached to  ciliary body  by  suspensory li...
- contains ciliary muscle; alter thickness of lens Suspensory ligaments
 
<ul><li>Iight sensitive </li></ul><ul><li>layer on which images are formed </li></ul>
Eye anatomy summary
Choroid Retina Blood vessels Optic nerve Fovea centralis Vitreous humour Sclera Suspensory ligaments Iris Pupil Cornea Aqu...
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
 
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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

  1. 1. Animal receptor organs Chapter 14
  2. 2. Sense organs <ul><li>Detect changes in surroundings  make proper adjustments  increase chances of survival </li></ul><ul><li>Receptors  receive stimuli  inform body of changes in environment </li></ul><ul><li>e.g. dendrites of receptor neurons, eye, ear </li></ul>
  3. 3. Mammalian eye <ul><li>lies within orbit (depression in skull) </li></ul><ul><li>attached by 6 rectus muscles  involved in rotating eyeball </li></ul>
  4. 5. Labeling eye exterior
  5. 6. Labeling eye exterior iris pupil sclera <ul><li>circular, disc-shaped structure with round hole (pupil) in the centre </li></ul><ul><li>colour varies </li></ul><ul><li>tough, white, fibrous coat </li></ul><ul><li>white of eye </li></ul><ul><li>protective layer around eyeball </li></ul><ul><li>size changes </li></ul><ul><li>regulates light entering (protect inner layer from damage) </li></ul>
  6. 8. <ul><li>thin transparent membrane; lubricated by tears secreted by lachrymal gland </li></ul>eyelid <ul><li>1) controls amt. of light entering ( squinting on sunny days) </li></ul><ul><li>2) protection ( blinking wipes off dust particles; spreads tears over eyeball; prevent drying up of conjunctiva) </li></ul>eyelashes - shields eye from dust particles
  7. 9. - secretes tears <ul><li>tears flow out btw eyelids and exposed part of eyeball, reducing friction when eyelids move </li></ul><ul><li>dust particles entering eye cause greater production of tears which wash them away </li></ul>- drains excess tears
  8. 10. Labeling eye interior
  9. 11. <ul><li>small bulge in front of eye (continuous with sclera) </li></ul><ul><li>transparent allows light to enter eye </li></ul><ul><li>denser medium c.f. air </li></ul><ul><li>light rays refracted inwards toward pupil and lens (greatest light refraction) </li></ul>
  10. 12. Lens <ul><li>Transparent, biconvex , crystalline lens </li></ul><ul><li>Edge attached to ciliary body by suspensory ligaments </li></ul><ul><li>Ciliary muscles (involuntary circular muscles) involved in focusing / * accommodation* </li></ul><ul><li>Curvature altered by action of ciliary muscles (elastic lens) </li></ul><ul><li>Changes in curvature alter focal length of lens so enabling clear images of objects at varying distances to be formed on the retina </li></ul>
  11. 13. - contains ciliary muscle; alter thickness of lens Suspensory ligaments
  12. 15. <ul><li>Iight sensitive </li></ul><ul><li>layer on which images are formed </li></ul>
  13. 16. Eye anatomy summary
  14. 17. 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
  15. 18. Activity (labeling the eye)
  16. 19. 1 2 3 4 5 6 7 8 9 10 11 ___12____ sclera
  17. 21. Test Yourself Labeling of the eye
  18. 22. 1 2 3 4 5 6 7 8 9 10 11

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