1. Sponge: Set up Cornell Notes on pg. 67 Topic: 12
Sponge: Set up Cornell Notes on pg. 67 Topic: 12.7: Structure of the Eye Essential Question: How does the shape of the lens change during accommodation?
12.7: Structure of the Eye
2.1 Atoms, Ions, and Molecules
How does the shape of the lens change during accommodation?
Turn in Lab 33 to printer

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

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

4. Structure of the Eye

5. Structure of the Eye Pg. 67 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 Directions: You will need 12 colors
As we go through each part of the notes, please color-code, label AND describe the “diagram of the eye”
Label small
Leave room to write notes
Continue on back if you run out of room

7. Layers of the Eye

8. Cornea

9. 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

10. Extrinsic Eye Muscles
Sclera

11. 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

12. Choroid
Coat

13. 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

14. + suspensory ligaments
Ciliary Body
+ suspensory ligaments

15. Middle Tunic Ciliary body Anterior portion of middle tunic
Secretes aqueous humor
Suspensory ligaments
Hold lens in position and moves lens

16. Aqueous Humor
(fluid)

17. 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

18. Lens

19. 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

20. Accommodation
P. 67
Accommodation: Changing of lens shape to view objects
Suspensory ligaments Ciliary ligaments
Close viewing: Relaxed Contracted Lens thick
Far Viewing: Contracted Relaxed Lens thin

21. Pupil
Iris

22. 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

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

24. 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

25. Posterior Cavity

26. 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

27. 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

28. Vision: Crash Course A+P 8m28s

29. Identifying Features/Other info
Structure of the Eye
Outer Tunic (pg. 470)
1. Cornea
2. Sclera
Middle Tunic (pg )
3. Choroid Coat
4. Ciliary Body
5. Lens & Accommodation
6. Aqueous Humor
7. Iris
8. Pupil
Inner Tunic (pg. 474)
9. Retina & Optic Disc
10. Posterior Cavity
Function
Illustration
Location
Identifying Features/Other info

30. 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