Sheep’s Eye Dissection Inside & Out: Taking a Closer Look.
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Transcript of Sheep’s Eye Dissection Inside & Out: Taking a Closer Look.
Sheep’s Eye Dissection
Inside & Out:Taking a Closer Look
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• Describe the function(s) of each structure
• Create a side view diagram of a human eye with appropriate labels
Materials:2-person lab group
22
Lab Instructions & PowerPoint Guide
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
Learning Target: Anatomy and Physiology of the Eye
External Anatomy:
Eye muscles• Attach firmly to the
eye and pull on the eyeball causing it move
Fatty tissue• Surrounds the eye to
cushion and protect it from damage
Optic nerve• Carries information from
the eye (retina) to the brain (Occipital lobe)
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 breakRetina• Lines the back of the eye• Location of photoreceptors• Cones – detect color (RGB)• Rods – detect light/dark (greys)
Learning Target: Anatomy and Physiology of the Eye
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
Internal Anatomy:
Learning Target: Anatomy and Physiology of the Eye
Lens• Round, biconcave clear disk• Focuses light onto retina• Held in place by suspensory
ligament
Internal Anatomy:
Ciliary muscles• Adjust shape of lens to focus
at different distances• Short & fat• Long and thin
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
Learning Target: Anatomy and Physiology of the Eye
Human Eye
ReferencesEye Dissection. (n.d.). Eye Dissection. Retrieved May 15, 2013, from http://science.jburroughs.org/resources/skeleton/eye/eyedissection.html
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• Describe the function(s) of each structure
• Create a side view diagram of a human eye with appropriate labels
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).