1. Sheep’s Eye Dissection Inside & Out:
4/23/2017
Sheep’s Eye Dissection Inside & Out:
Taking a Closer Look

2. Anatomy and Physiology of the Eye
Learning Target:
Anatomy and Physiology of the Eye
I Can…Compare and contrast the structures of a sheep’s eye to that of a human eye and describe the structure and function of the components of an eye.
I Will…
Dissect a preserved sheep’s eye;
Identify the external structures of the eye
Describe the function(s) of each structure
Identify the internal structures of the eye
Create a side view diagram of a human eye with appropriate labels

3. Materials:
2-person lab group 2 2
Lab Instructions & PowerPoint Guide

4. Anatomy and Physiology of the Eye
Learning Target:
Anatomy and Physiology of the Eye
External Anatomy:
Sclera
Tough white outer covering of eye that protects internal structures of eye
Cornea
Clear extension of sclera in front of the eye that allows light to enter the eye

5. Anatomy and Physiology of the Eye
Learning Target:
Anatomy and Physiology of the Eye
External Anatomy:
Optic nerve
Carries information from the eye (retina) to the brain (Occipital lobe)
Fatty tissue
Surrounds the eye to cushion and protect it from damage
Eye muscles
Attach firmly to the eye and pull on the eyeball causing it move

6. Anatomy and Physiology of the Eye
Learning Target:
Anatomy and Physiology of the Eye
Internal Anatomy:
Vitreous humor
Clear jelly-like substance
Helps hold shape of the eye
Clear to let light through
Jelly not solid so wont crack or break
Retina
Lines the back of the eye
Location of photoreceptors
Cones – detect color (RGB)
Rods – detect light/dark (greys)

7. Anatomy and Physiology of the Eye
Learning Target:
Anatomy and Physiology of the Eye
Internal Anatomy:
Blind spot/Optic disk
Point where retina leaves to become optic nerve
No photo receptors located there.
Tapetum
Located behind retina
Shiny and reflective
Helps animals to see in low light
NOT found in human eyes

8. Anatomy and Physiology of the Eye
Learning Target:
Anatomy and Physiology of the Eye
Internal Anatomy:
Lens
Round, biconcave clear disk
Focuses light onto retina
Held in place by suspensory ligament
Ciliary muscles
Adjust shape of lens to focus at different distances
Short & fat
Long and thin

10. Anatomy and Physiology of the Eye
Learning Target:
Anatomy and Physiology of the Eye
Internal Anatomy:
Iris
Colored area in front of the lens
Pupil
Clear opening in iris that allows light to enter eye
Size controlled by two sets of muscles in iris
Constriction – smaller
Dilation – larger
Controls amount of light

11. Human Eye Learning Target: Anatomy and Physiology of the Eye
References
Eye Dissection. (n.d.). Eye Dissection. Retrieved May 15, 2013, from

12. Anatomy and Physiology of the Eye
Learning Check:
Anatomy and Physiology of the Eye
I Can…Compare and contrast the structures of a sheep’s eye to that of a human eye and describe the structure and function of the components of an eye.
I Will…
Dissect a preserved sheep’s eye;
Identify the external structures of the eye
Describe the function(s) of each structure
Identify the internal structures of the eye
Create a side view diagram of a human eye with appropriate labels

13. Sheep’s Eye Dissection
Video Learning Check:
Sheep’s Eye Dissection
Name: ________________ Per. _____ Date: _______
List and describe two differences between a sheep’s eye and a human’s eye that were mentioned in the video (E.C. if you can name three).