Chapter 6 Special Sensory Organs: Eye and Ear 241 Key Term Defi nition ossicles three small bones of the ear that transmit vibrations from the eardrum to the internal ear pupil opening in the iris that contracts and dilates, regulating the amount of light that enters the eye retina innermost layer of the eye that receives images formed by the lens sclera white, outer protective layer of the eye semicircular canals tiny channels in the inner ear that control balance tympanic membrane eardrum E-Flash Card Activity: Anatomy and Physiology Vocabulary Directions: After you have reviewed the anatomy and physiology vocabulary related to the sensory organs of sight and hearing, practice with the e-fl ash cards until you are comfortable with the spelling and defi nition of each term. Assessment Identifying Major Structures of the Eye Directions: Label the anatomical diagram of the eye. 1. __________________________ 2. __________________________ 3. __________________________ 4. __________________________ 8. __________________________ 7. __________________________ 6. __________________________ 5. __________________________ SCORECARD: How Did You Do? Number correct (_____), divided by 8 (_____), multiplied by 100 equals _____ (your score)