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LABORATORY NINE Special Senses. Cow Eye Dissection (Google, Image, Cow Eye Dissection) Identify the assigned superficial structures Make a coronal section.

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Presentation on theme: "LABORATORY NINE Special Senses. Cow Eye Dissection (Google, Image, Cow Eye Dissection) Identify the assigned superficial structures Make a coronal section."— Presentation transcript:

1 LABORATORY NINE Special Senses

2 Cow Eye Dissection (Google, Image, Cow Eye Dissection) Identify the assigned superficial structures Make a coronal section –With the scalpel make an incision 1cm (the width of the scalpel's blade) below the junction of cornea & sclera –With scissors cut around the cornea keeping the 1cm distance from the junction all around –To remove the jellylike transparent substance, hold down the lens by left thumb and scoop out the jellylike substance by right thumb –Detach the lens from the iris –Scoop out the jellylike substance from the posterior cavity very gently not to disturb the retina (immerse the posterior part of the cow eye in the water to reshape the retina) Identify the assigned structures Use the human eye model to study the muscles responsible for eye movement

3 Sensory Nerve Endings in the Skin

4 #2 & #3, p152: Two-point discrimination test #4, p152: Duration of sensation Subjects eyes should be closed Record your observations in the related section in your lab report Cutaneous Sensation (Exercise 9A, P151)

5 Muscles of the Eye To identify the medial/lateral ends of the eye: For superior/inferior oblique muscles, their attached part to the sclera is the more lateral side Optic nerve II is located more medially

6 Sagittal Section of the Eye

7 Vision (Exercise 9B, p153) #4, p153: Blind spot test #5, p154: Visual acuity #6, p154: Astigmatism #7, p155: Color blindness Record your results in the related section in your lab report

8 External, Middle, and Inner Ear

9 Organ of Corti (Observe the model & demonstration microscope)

10 Hearing and Equilibrium (Exercise 9C, p155) #3, p156: Hearing acuity test #4, p157: Ability to locate the source of a sound #5, p157: The Rinne test #6, p157: Evaluation of balance Subjects eyes should be closed Record your observations in the related section in your lab report

11 The Tongue (a) Dorsal Surface (b) Papilla (enlargements on the surface of the tongue) (c) Taste bud (view the microscopic slide)

12 Taste and Olfaction (Exercise 9D, p158) Test your sense of taste using a taste paper Record your results in the related section in your lab report


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