Sponge: Set up Cornell Notes on pg. 57

Topic: 12.5: External Ear

Essential Questions:1. Color code notes and

Picture Bubble Map Figure 12.9

• Auricle• External Acoustic Meatus• Tympanic Membrane

2.1 Atoms, Ions, and Molecules

12.5: External Ear

Want EXTRA CREDIT???• Report Card Night

• Thurs 5:30-8pm• Visit IB Art Show @ Mall

• Sign in• Little Mermaid in Little

Theatre• Wed 6pm/Fri 6pm/ Sat 2pm• Take a pic or ticket stub

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HearingEar – organ of hearing

Three Sections• External• Middle• Inner

Sound Waves and Our Ears (3m 28s)

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External Ear

• Auricle (oar-i-cle)• Funnel like structure• Collects sounds waves

traveling through the air• Directs them into the external

acoustic meatus (me-a-tus)

The external ear consists of all of the structures that face the outside

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• External acoustic meatus (me-a-tus) aka “ear canal”• Passes into temporal bone• Carries sound to tympanic membrane (ear drum)

• Lined with ceruminous (ser-room-inous) glands which secrete wax

• Hairs guard the tube• Hair and wax keep large foreign objects, such as

bugs, out of the ear

A tickling on the ear drum

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•Tympanic membrane aka ear drum • Vibrates in response to sound waves• Reproduces the vibrations of the

sound-wave source

The Outer and Middle Ear (3m28s)

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Figure 12.09

• On pg. 56 Create Picture Bubble Map

• Color code to match notes

• Add the FUNCTION to each label

Pg. 56

Now Hear This: Don’t Remove Earwax Reading

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• Read/Highlight/ Answer Questions• Class Discussion

Pg. 56