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Name
Period
Date
INTRODUCTION
The eye is a most complex sense organ. It can detect
differences in light intensity, color, and motion. It’s a
perfect example of a body organ where form follows
function. This means that each eye part (form) is perfectly
designed to carry out its specific job (function).
REFERENCES
 “Cow Eye Dissection.” Exploratorium 6/1/07
http://www.exploratorium.edu/learning_studio/cow_eye/
 Life Science text p. 643 - 645
OBJECTIVES
 Observe and identify the exterior parts of the eye
 Use a model to study the action of four eye muscles
 Observe and identify the interior parts of the eye
MATERIALS
preserved eye
dissecting pan
Figure 1.
Table 1. Appearance and Function of Exterior Eye Parts
Part
Sclera
scissors/scalpel
Styrofoam model
probe
forceps
PROCEDURE
PART A – EXTERIOR PARTS OF AN EYE
1. Examine the preserved eye that has been placed in the
dissecting pan.
2. Locate the following parts using Figure 1 as a guide:
sclera, iris, pupil, eye muscles, optic nerve and cornea.
3. Describe the appearance and job or function of these eye
parts using available references; record in Table 1.
Iris
Pupil
Eye
muscles
Optic
nerve
Cornea
Appearance
Function (job)
PART B – EYE MUSCLE MOVEMENT
1. Observe the model Styrofoam eye provided by your
teacher. Refer to the model for correct orientation.
2. Determine the action of each of the muscles. Make sure
to note the location of the muscle compared to the
direction it moves the eye.
3. Record the direction the eye moves in Table 2.
4. Describe the appearance and job or function of these eye
parts using available references; record in Table 3.
Table 2. Eye Muscle Action
Muscle
Muscle
Name
1
Superior
rectus
2
Inferior
rectus
3
Lateral
rectus
4
Medial
rectus
Location
on Eye
Direction Eye Moves
as Muscle Contracts
PART C – THE INTERIOR OF AN EYE
1. Using the preserved eye, make a circular cut with your
scissors through the sclera.
2. Separate the eye into two halves. A jellylike material and
marble-shaped part may fall out of the cut eye (save
them).
3. Locate the following eye parts using Figure 2 as a guide:
retina, tapetum, ciliary muscles, lens, and vitreous
humor.
Figure 3.
Table 3. Interior Structures of the Eye
Part
Retina
Tapetum
Ciliary
muscles
Lens
Vitreous
humor
Appearance
Function (job)
Connective
tissue
Nerve tissue
Can change
shape

Muscle tissue
Check () the appropriate columns for each structure of the eye.
Check as many that apply.
Light does
not pass
through
Identify 4 specific safety procedures
you followed during this lab.
Light does
pass through
CONCLUSION AND ANALYSIS
Sclera






Cornea






Lens






Vitreous
humor






Pupil






Ciliary
muscles






Retina






Superior
rectus
Lateral
rectus












Iris






Optic
nerve






Eye Part


