csd 3103 anatomy of speech and hearing mechanisms hearing mechanisms fall 2008
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CSD 3103 anatomy of speech and hearing mechanisms Hearing mechanisms Fall 2008. The Outer Ear. The outer ear. Cross section of the external ear. Major structures of The outer ear. Pinna or auricle External auditory meatus or external ear canal Tympanic membrane or eardrum. The pinna.

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Presentation Transcript
the outer ear
The outer ear

Cross section of the external ear

major structures of the outer ear
Major structures of The outer ear
  • Pinna or auricle
  • External auditory meatus or external ear canal
  • Tympanic membrane or eardrum
the pinna
The pinna
  • Size and shape varies from person to person
  • Gathers sound from the environment and funnels it to the eardrum
  • Made entirely of cartilage and covered with skin
the pinna5
The pinna

Major landmarks

on the pinna

the pinna6
The pinna

Geographic landmarks for the pinna

resonance properties of the pinna
Resonance properties of The pinna

Resonance effects of the helix (flange) and concha in the most favorable azimuth position. The helix has a 2 dB peak at 4000 Hz. The concha has a 9 dB increase at 5300 Hz.

the pinna8
The pinna

The pinna and its

major landmarks

the external auditory canal
The external auditory canal

Cross section of the external ear

the external auditory canal10
2.5 cm long

S-shaped

Outer 1/3 is cartilaginous

Inner 2/3 is bone

Structures

Sebaceous glands

Hair follicles

Osseocartilaginous junction

The external auditory canal
the external auditory canal11
The external auditory canal

Resonance effects of the external auditory meatus, shown as the ratio of the SPL at the eardrum to the SPL at the entrance of the ear canal at 0o azimuth.

the external auditory canal12
The external auditory canal

Combined effects of the presence of the head in a sound field. The upper solid curve represents 0o azimuth, long dashes represent 45o, and the short dashes represent a 90o azimuth.

the tympanic membrane
The tympanic membrane

Major landmarks of the tympanic membrane

the tympanic membrane14
The tympanic membrane

A healthy right tympanic membrane

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