Special Senses The Eyes and Ears Chapter 11

Special Senses: The Eyes and Ears Chapter 11 © 2015, Cengage Learning. All Rights Reserved.

Overview of Structures, Combining Forms, and Functions of the Eyes and Ears © 2015, Cengage Learning. All Rights Reserved.

Eyes (and Vison) • Primary Function – Receptor organs for the sense of sight • Related Word Parts (Combining Forms) – opt/i, opt/o, optic/o – ophthalm/o © 2015, Cengage Learning. All Rights Reserved.

Structures of the Eyes • Adnexa: structures outside the eyeball – Orbit, eye muscles, eyelids, eyelashes, conjunctiva, lacrimal apparatus • Eyeball: also known as the globe (continues) © 2015, Cengage Learning. All Rights Reserved.

© Cengage Learning Structures of the Eyes (continues) © 2015, Cengage Learning. All Rights Reserved.

© Cengage Learning Structures of the Eyes (continues) © 2015, Cengage Learning. All Rights Reserved.

© Cengage Learning Structures of the Eyes (continues) © 2015, Cengage Learning. All Rights Reserved.

© Cengage Learning Structures of the Eyes © 2015, Cengage Learning. All Rights Reserved.

Lacrimal Apparatus • Primary Function – Produces, stores, and removes tears • Related Word Parts (Combining Forms) – dacryocyst/o – lacrim/o © 2015, Cengage Learning. All Rights Reserved.

Iris • Primary Function – Controls the amount of light entering the eye • Related Word Parts (Combining Forms) – ir/i, ir/o – irid/o – irit/o © 2015, Cengage Learning. All Rights Reserved.

Lens • Primary Function – Focuses rays of light on the retina • Related Word Parts (Combining Forms) – phac/o – phak/o © 2015, Cengage Learning. All Rights Reserved.

Retina • Primary Functions – Converts light images into electrical impulses and transmits them to the brain • Related Word Parts (Combining Forms) – retin/o © 2015, Cengage Learning. All Rights Reserved.

Ears (Hearing and Sound) • Primary Function – Receptor organs for the sense of hearing – Help to maintain balance • Related Word Parts (Combining Forms) – acous/o, acoust/o – audi/o, audit/o – ot/o © 2015, Cengage Learning. All Rights Reserved.

© Cengage Learning Structures of the Ears © 2015, Cengage Learning. All Rights Reserved.

Outer Ear • Primary Function – Transmits sound waves to the middle ear • Related Word Parts (Combining Forms) – pinn/i © 2015, Cengage Learning. All Rights Reserved.

Middle Ear • Primary Function – Transmits sound waves to the inner ear • Related Word Parts (Combining Forms) – myring/o – tympan/o © 2015, Cengage Learning. All Rights Reserved.

Inner Ear • Primary Function – Receives sound vibrations and transmits them to the brain • Related Word Parts (Combining Forms) – labyrinth/o © 2015, Cengage Learning. All Rights Reserved.

Key Word Parts and Definitions • blephar/o – eyelid • -cusis – hearing • irid/o – iris, colored part of eye • kerat/o – horny, hard, cornea (continues) © 2015, Cengage Learning. All Rights Reserved.

Key Word Parts and Definitions • myring/o – tympanic membrane, eardrum • ophthalm/o – eye, vision • -opia – vision condition • opt/o – eye, vision (continues) © 2015, Cengage Learning. All Rights Reserved.

Key Word Parts and Definitions • ot/o – ear, hearing • phak/o – lens of eye • presby/o – old age • retin/o – retina, net (continues) © 2015, Cengage Learning. All Rights Reserved.

Key Word Parts and Definitions • scler/o – sclera, white of eye, hard • trop/o – turn, change • tympan/o – tympanic membrane, eardrum © 2015, Cengage Learning. All Rights Reserved.

Questions © 2015, Cengage Learning. All Rights Reserved.

Question The smallest bone in the body is the stapes, or stirrup bone, of the middle ear. True or False? © 2015, Cengage Learning. All Rights Reserved.

Question A ringing, buzzing, or roaring sound in one or both ears is called: a. tinnitus b. labyrinthitis c. tintinitus © 2015, Cengage Learning. All Rights Reserved.

Question Men are how many times more likely to be color-blind than women? a. 2 b. 10 c. 5 © 2015, Cengage Learning. All Rights Reserved.

Question If not treated promptly, open-angle glaucoma can cause blindness in as little as 2 days. True or False? © 2015, Cengage Learning. All Rights Reserved.