1. Sponge: Set up Cornell Notes on pg. 43 Topic: 12
Sponge: Set up Cornell Notes on pg. 43 Topic: 12.4: Structure of the Eye Essential Question: How does the shape of the lens change during accommodation?
12.4: Structure of the Eye
2.1 Atoms, Ions, and Molecules
How does the shape of the lens change during accommodation?

2. Objective
SWU: the major anatomy of the eye In groups, SW: create an informational poster identifying their assigned location + function for each part of the eye

3. REVIEW: Special Senses
Location of special senses?
Sensory receptors are within large, complex sensory organs in the head
Sight in eyes----->Photoreceptors-Rods and cones

4. Structure of the Eye
Which parts of the eye have you heard of before? Or know the location to?
Pupil
Lens
Iris
Cornea
Retina

5. Structure of the Eye Structure of the Eye: Hollow
Spherical (2.5 cm diameter)
Wall has 3 layers
Outer fibrous tunic
Middle vascular tunic
Inner nervous tunic

6. Structure of the Eye Posters
20 minutes
Outer Tunic (pg. 470)
1. Cornea + Sclera
Middle Tunic (pg )
2. Choroid Coat
3. Ciliary Body + suspensory ligaments
4. Lens & Accommodation
5. Aqueous Humor
6. Iris
7. Pupil
Inner Tunic (pg. 474)
8. Retina & Optic Disc
9. Posterior Cavity
Title
CLEAR Illustration
Specific Location
Function
Identifying Features/Other info
If done, return to seat and work on Pain HW from yesterday—signed on Thurs

7. Structure of the Eye Directions: You will need 12 colors
As we go through each part of the notes, please color-code and label the “diagram of the eye”
Label small
Leave room to write notes later

8. Extrinsic Eye Muscles

9. Cornea

10. Sclera

11. Choroid
Coat

12. + suspensory ligaments
Ciliary Body
+ suspensory ligaments

13. Aqueous Humor
(fluid)

14. Lens

15. Pupil
Iris

16. Retina
Macula Lutea
Fovea Centralis
Optic Nerve (II)
Optic Disc

17. Posterior Cavity

18. Objective
SWU: the major anatomy of the eye In groups, SW: take a gallery walk of their informational posters to identify the functions + location of each part of the eye

19. Structure of the Eye : Gallery Walk
27 minutes
Outer Tunic (pg. 470)
1. Cornea + Sclera
Middle Tunic (pg )
2. Choroid Coat
3. Ciliary Body + suspensory ligaments
4. Lens & Accommodation
5. Aqueous Humor
6. Iris
7. Pupil
Inner Tunic (pg. 474)
8. Retina & Optic Disc
9. Posterior Cavity

20. Aqueous Humor Extrinsic Eye Muscle Retina Macula Lutea Cornea
Fovea Centralis
Cornea
Optic Nerve
Posterior Cavity
Pupil
Optic
Disc
Choroid
Coat
Iris
Sclera
Lens
Ciliary Body

21. Cornea

22. Outer Tunic Cornea aka “Window of the eye” Anterior 1/6 of outer eye
Transparent
No blood vessels
Focuses incoming light rays
Well supplied with nerves
Many pain receptors
Cornea

23. Extrinsic Eye Muscles
Sclera

24. Outer Tunic Sclera Posterior 5/6 of outer eye White portion of eye
Protects the eye
Attachment for extrinsic muscles
Optic nerve pierces the sclera in the back

25. Choroid
Coat

26. Middle Tunic Choroid Coat Choroid coat Many blood vessels
Provides blood supply
Many melanocytes (pigments) that absorb extra light
Keeps inside of eye dark
Choroid
Coat

27. + suspensory ligaments
Ciliary Body
+ suspensory ligaments

28. Middle Tunic Ciliary body Anterior portion of middle tunic
Secretes aqueous humor
Suspensory ligaments
Hold lens in position and changes the shape of the lens for accommodation

29. Aqueous Humor
(fluid)

30. Middle Tunic
Aqueous humor (a-quee-us): fluid that circulates through the pupil and into the anterior chamber of the eye
Provides nutrients
Maintains the shape of the front of eye
Removes waste
If drainage is blocked—leads to glaucoma which can result in blindness

31. Lens

32. Middle Tunic Lens Lies behind iris and pupil Elastic
Under constant tension
Puts near/far objects into focus
As we age, lens becomes larger and less elastic which leads to vision impairment
About the size of an
20/20 isn’t perfect– it means you can 20 ft. what the average person sees at 20 ft.

33. Accommodation Accommodation: Changing of lens shape to view objects
Suspensory ligaments Ciliary ligaments
Close viewing: Relaxed Contracted Lens thick
Far Viewing: Contracted Relaxed Lens thin

34. Pupil
Iris

35. Middle Tunic Iris Colored portion of eye Lies between cornea and lens
Smooth muscles that control the size of the pupils
Pupils
Controls light intensity
Constricted: less light in
Dilated: more light in
Pigmentation changes happen within first year of life– based on melanocyte production of melanin JUST LIKE YOUR SKIN

36. Retina
Macula Lutea
Fovea Centralis
Optic Nerve (II)
Optic Disc

37. Inner Tunic
Retina
Contains visual receptors (photoreceptors) rods/cones
Continuous with optic nerve
Macula lutea (mac-ula lu-tay-a) –spot in retina; absorbs extra light
Fovea (fo-vea) centralis – center of macula lutea; region of retina that produces the sharpest vision; has largest concentration of cone cells
Optic disc – Blind spot; contains no visual receptors
Nerve fibers leave here and become part of the optic nerve

38. Posterior Cavity

39. Inner Tunic Posterior Cavity Largest compartment in eye
Contains vitreous (vi-tree-us) humor – jelly-like substance that holds retina flat against choroid coat maintaining pressure
Helps transmit light to retina

40. Pg m44s
Human Body: Pushing the Limits: Sight
15 bullets

41. FAQ Does the eyeball grow?
Yes! About 16mm at birth. Grows at 2-3 years then pauses. Then finishes growth at puberty.

42. Vision: Crash Course A+P 8m28s

43. 3-5 Bullets Each Video Notes: Split bottom pg. 66 into four sections
Outer fibrous tunic
Middle vascular tunic
Inner nervous (sensory) tunic
The Humors and the Lens
3-5 Bullets Each