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