AP II Module 3 | 2026 Verified Questions & Detailed Answers

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Vision and the Eye

1. What are the five special senses?

 Vision
 Smell
 Taste
 Hearing
 Equilibrium (balance)

2. What are the two parts of the outer layer of the eye?

 Sclera
 Cornea

3. What is included in the middle layer of the eye?

 Choroid
 Ciliary muscle
 Iris

4.The pupil is a hole in the ____.

 Center of the Iris

5.The inner sensory layer is the _____.

 Retina

6.What are the two types of photoreceptors and their functions?

Photoreceptors are cells that are sensitive to light.

 Rods – Stimulated in dim light
o More numerous
o More sensitive to light but do not produce sharp or color images
 Cones – Stimulated in bright light
o Produce sharp color images

7.The interior of the eye (posterior to the lens) is filled with_____.

 Vitreous fluid - helps hold the retina firmly to the choroid.

8.True or False: The vision pathway begins as the optic tracts, crosses at
the optic chiasm and then moves through the optic nerve.

 False - Vision pathway begins with the optic nerve, crosses at the optic
chiasm, and continues as the optic tract.



9.Where is the LGN located?

 A region in the thalamus where the optic tracts terminate


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10. True or False: The nasal visual field is the visual field on the lateral
sides of each eye.

 The nasal visual field is closer to the nose - the medial side of each eye,
 The lateral side is considered the temporal visual field.


Vision and the Eye

11. What allows for 3-D vision?

 Called Binocular Visual Field
 Information overlap in the nasal visual fields

12. True or false: Only the medial fibers cross at the optic chiasm.

 True
 only the optic nerve's medial (nasal) fibers cross over, while the lateral
(temporal) fibers remain uncrossed.

13. The left side of the brain receives information from the _________ of
the left eye and the ________ of the right eye.

bilateral right visual fields

 Medial
 Lateral

14. On a piece of paper, draw the visual pathway using two different
colors. Note one comment below about what you learned about the vision
pathway:

 The visual pathway of the lateral side of each eye overlaps to form binocular
vision

15. The medial rectus turns the eye _____. The medial rectus is
controlled by CN _____.

 Medially
 (Three) III




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