1. Table of Contents

2. Lessons 1. Intro to the Sensory System Go Go 2. Vision Go Go 3. Hearing Go Go 4. Smell, Taste, and General Senses Go Go 5. Sensory System Diseases and Disorders Go Go

3. Table of Contents  Sensory system ◦ vision ◦ hearing ◦ smell ◦ taste ◦ touch  Receives stimuli and sends impulses to the brain to be interpreted.  Recognizes changes in the environment

4. Table of Contents  Eye carries information to the brain where it is translated into vision, or sight.  Vision is considered to be the most important sense.

5. Table of Contents  Sclera – outer eye  Choroid coat – middle eye  Retina – inner eye

6. Table of Contents  Iris  Pupil  Lens  Aqueous humor  Vitreous humor

7. Table of Contents  In order: ▫Cornea ▫Aqueous humor ▫Pupil ▫Lens ▫Vitreous humor

8. Table of Contents  Partly enclosed in a bony socket in the skull.  Lacrimal glands  Eyelids and eyelashes help keep out foreign materials.  Conjunctiva

9. Table of Contents  Controls hearing and sense of balance  Ear carries sound waves to the brain  Three main sections: ◦ Outer ear ◦ Middle ear ◦ Inner ear

10. Table of Contents  Pinna  Auditory canal  Tympanic membrane

11. Table of Contents  Small chamber in the temporal bone  Ossicles  Eustachian tube

12. Table of Contents  Cochlea  Semicircular canals

13. Table of Contents  The nose is the organ that controls smell.  Olfactory receptors  Cilia  The sense of smell is closely related to the sense of taste.

14. Table of Contents  Taste buds  The receptors in the taste buds send a signal to the brain to detect the flavor of the food.  The four basic tastes: ▫Sweet ▫Salty ▫Sour ▫Bitter

15. Table of Contents  General senses: ◦ Touch ◦ Temperature ◦ Pressure ◦ Pain  General sense receptors are located throughout the body in the skin and connective tissue.  Each receptor perceives only one type of feeling.

16. Table of Contents  Conjunctivitis  Cataract  Hearing Loss  Otitis Media  Common Cold