Chapter 8

3. The inside layer of the eyeball where specialized nerve cells called rods and cones are found.
6. A mucous membrane called the _____ lines the inner surfaces of the eyelids and covers the anterior sclera surface of the eye.
8. When the image is improperly refracted and focuses beyond the retina, the person is said to be farsighted, or to have _____.
11. A clear that maintains the curvature of the cornea and assists in the refraction process.
13. The _____ palpebrae superioris, does not move the eyeball but is attached to and moves the eyelid.
14. Where the optic nerves exit the retina, there are neither rods nor cones, so this area is referred to as the optic disc or _____.
15. The tympanic membrane more commonly known as the ______.
17. The sense of smell originates with the _____ sensory neurons in the top of the nasal cavity.

1. The ____ tube connects the middle ear to the throat to equalize air pressure but can allow throat infections to enter the ear, and rapid altitude changes, forceful nose-blowing, or sneezing can cause pressure imbalances.
2. The tough white _____ covers and helps maintain the eyeball's shape while anchoring six extraocular muscles
4. The _______ canals are responsible for maintaining equilibrium or balance.
5. A thick, jellylike substance aids in refraction and helps maintain the shape of the eyeball.
7. The _____ body changes shape to help focus objects onto the retina.
9. When the image focuses in front of the retina, the person is said to be nearsighted, or to have _____.
10. Each of the contact receptors in the skin has its own perceptive function, enabling us to feel ______ different sensations
12. When the ciliary body _____, the lens becomes rounder in a process known as accommodation to permit near vision.
16. A transparent extension of the sclera that lies in front of the pupil correcting some of the unclear image that the edge of the lens projects.