Hearing Anatomy

Hearing Anatomy - Chapter 9 Anatomy of Hearing The...

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Anatomy of Hearing Chapter 9
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The Functions and Structures of Hearing § Audition § The process associated with hearing § Vital part of verbal communication § The ear changes acoustic energy into electrochemical energy – acts as energy transducer § Structures of the ear § Outer, middle, inner ear, auditory pathways
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The Functions and Structures of Hearing
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The Functions and Structures of Hearing Hearing Animation
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Outer Ear
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Structures of the Outer Ear § The pinna (auricle) § Prominence referred to as “the ear” § Structure provided by a cartilaginous framework § Collector of sound that is processed in the middle ear and cochlea
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Structures of the Outer Ear § External auditory meatus (EAM) § External ear canal Approximately 7mm in diameter Roughly S-shaped A resonating cavity Isthmus – a constriction within the EAM ~ 0.5 cm from the tympanic membrane § Terminates at the tympanic membrane § Two-thirds of ear canal housed in bone § One-third of ear canal composed of cartilaginous parts
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Landmarks of the Outer Ear Auricle (Pinna) – primary collector of sound § Helix – curled margin of the pinna § Concha – entrance to ear canal § Tragus - flap of tissue at the entrance to the ear canal § Lobule - noncartilaginous region in the inferior aspect of the pinna
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Landmarks of the Outer Ear
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Tympanic Membrane § Has both osseous and cartilaginous parts § Boundary between outer and middle ear § Approximately 55mm2 in area § Umbo – most distal point of attachment to the malleus
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Tympanic Membrane § Responsible for initiating mechanical impedance-matching process of middle ear § Appears slightly concave as viewed from the ear canal § First layer: outer (cuticular) layer § Second layer: Intermittent (fibrous) layer
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This document was uploaded on 10/31/2011 for the course COMD 501 at South Carolina.

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Hearing Anatomy - Chapter 9 Anatomy of Hearing The...

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