fundies-ch6rev - CHAPTER 6 Outer and Middle Ears Which Way...

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CHAPTER 6 Outer and Middle Ears
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Which Way? Anterior/Ventral = toward the front Posterior/Dorsal = toward the back Lateral = toward the side Medial = toward midline Superior = toward upper surface (rostral) Inferior = toward lower surface (caudal)
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Gotta Catch a Plane Sagittal - dividing right from left Coronal (Frontal) -dividing front from back Horizontal -dividing up from down
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The Temporal Bone - Part of the Skull
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Temporal Bone:Lateral/Medial Views
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The Temporal Bone houses the “Ear”
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The Outer Ear Consists of: The Pinna - cartilaginous, highly variable in appearance, some landmarks. External Auditory Canal (or external auditory meatus) - 2.5 cm tube.
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Pinna Landmarks Helix Antihelix Concha Tragus Intertragal Notch Antitragus
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External Auditory Canal lateral portion-cartilage medial portion-osseous lined with epidermal (skin) tissue hairs in lateral part cerumen (ear wax) secreted in lateral part.
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Outer Ear Functions 1 Amplification / Filtering -- increases sounds between 1500 and 7000 Hz by 10 to 15 dB -- because of the resonance of Concha -- 5000 Hz E.A.Canal -- 2500 Hz
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Outer Ear Functions 2 Protection -- medial displacement of ear drum -- curvature of canal -- hairs -- cerumen -- skin migration
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This note was uploaded on 08/23/2011 for the course SPA 3032 taught by Professor Gerhardt during the Spring '08 term at University of Florida.

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fundies-ch6rev - CHAPTER 6 Outer and Middle Ears Which Way...

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