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26 Cards in this Set
- Front
- Back
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Ear anatomy divides into what 4 areas?
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1. Outer Ear
2. Middle Ear 3. Inner Ear 4. Higher Auditory Pathways |
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Rim-like periphery of the auricle (pinna)
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Helix
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Second semi-circular ridge, anterior to the helix
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Anti-Helix
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A transverse ridge continuing backward from the helix of the auricle, dividing the concha into an upper portion (cymba) and a lower portion (cavity of concha).
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Crus of helix
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Depression between the helix and antihelix
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Scaphoid fossa
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Deep depression in auricle
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Concha
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2 parts of Concha and location
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Cymba - superior
Cave - inferior |
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Small pointed eminence of the external ear, situated in front of the concha, and projecting backward over the meatus
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Tragus
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a small ridge opposite of the cartilaginous flap and forms the inferior boundary of the concha
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Anti-Tragus
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Notch that separates the tragus and antitragus
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Intertragral Incisure
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Inferior extremity to the ear
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Lobe
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Depression just inferior of the anterior and superior part of the helix,
triangle shaped, and superior to the concha cymba |
Triangular Fossa
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variation within helix, near the tip and posteriorly is a thickened portion called (2 names)
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Darwin's tubercle or Auricular tubercle
(not everyone has one) |
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The Auricle helps localize sound from _____ to ______ but not from side to side.
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front, back
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The beginning and end portions of the ear canal are slightly ________ than the middle.
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lower
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1/3-1/2 of the lateral part of the EAM is:
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cartilage
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2/3-1/2 of the medial part of the EAM is:
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bone
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The juncture at which the cartilaginous portion of the EAM meets with the osseous portion of the EAM is called:
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isthmus
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The oval opening of the canal is __ to __ mm in diameter.
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6,8
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The lining of the the lateral 1/3 of the EAM is what and describe function:
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Cutaneous - lined with hair or cilia and cerumen (ear wax produced by glands)
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The ear canal is __ shaped and consists of what three parts?
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S, pars externa (medial, anterior, superior), pars media (medial, posterior), pars interna (meidal, anterior, inferior)
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What is the primary function of the EAM?
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To direct sound energy to the tympanic membrane or ear drum.
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What causes people to think that the EAM serves as a protective mechanism?
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The fact that the essential anatomy of the hearing mechanism is recessed into the boney structures of the skull.
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What is the peak resonance of the ear canal?
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2500 hz
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What is the peak resonance of the concha?
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5000 hz
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What is the peak resonance of all the ear structures together?
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3800 hz
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