Sheep’s Eye Dissection Inside & Out: 4/23/2017 Sheep’s Eye Dissection Inside & Out: Taking a Closer Look http://msbrownnhs.sharepoint.com

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

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

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

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

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)

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

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

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

Human Eye Learning Target: Anatomy and Physiology of the Eye References Eye Dissection. (n.d.). Eye Dissection. Retrieved May 15, 2013, from http://science.jburroughs.org/resources/skeleton/eye/eyedissection.html

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

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).