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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