Outer Ear

Question 0

Fossa

Answer 0

Trench
Ditch
Depression

Question 1

Outer Ear Comprised of:

Answer 1

1. Auricle / Pinna
2. External Auditory Canal / External Auditory Meatus
3. Tympanic Membrane (common boundary)

Question 2

Landmarks of Pinna

Answer 2

Helix
Antihelix
Crura of Antihelix
Helix Crus
Scaphoid Fossa
Triangular Fossa
Concha Cymba
Concha Covum
Tragus
Antitragus
Intertragal Notch
Lobule

Question 3

Function of the Auricle / Pinna

Answer 3

Catch & Funnel Sound

Question 4

Auricle and Pinna is Made of :

Answer 4

Cartilage Epithelial Proper

Question 5

Pinna / Auricle Attachment Points

Answer 5

Posterior - Mastoid Process

Anterior - Zygomatic Arch

Question 6

Auricle / Pinna Attachments

Auricle Muscles

Answer 6

Anterior, Superior & Posterior

Question 7

Auricular Ligaments Attach

Answer 7

Anterior & Posterior

Question 8

Auricular Muscles are:

Answer 8

Vestigial

Question 9

The EAM / EAC
length
resonant frequency
angle

Answer 9

~ 1 inch
~ 3.300 Hz
angled down in adults and up in children

Question 10

EAM / EAC outer 1/3 consists of:

Answer 10

cartilage
sebaceous glands
ceruminous glands
epithelial proper
hair

Question 11

EAC / EAM inner 2/3 consists of :

Answer 11

bone

epithelial proper

Question 12

Osseocartilaginous Junction

Answer 12

Where the inner & outer EAC join

Question 13

Condyle

Answer 13

Protrusion of the mandible & rests below the Osseocartilaginous junction

Question 14

Temporomandibular Joint TMJ

Answer 14

When the jaw is misaligned and can cause Otaliga ..ear pain in adults

Question 15

EAC / EAM Innervation

Answer 15

Trigeminal - Superior / Posterior
Vagus - Inferior / Anterior
Stimulation of Vagus - Cough reflex

Question 16

Resonant Properties of EAC Causes

Answer 16

Amplification of High Frequencies

Decrease of Low Frequencies

Question 17

TM Boundary

Answer 17

Common boundary between outer and middle ear

Question 18

Upper 1/3 (30mm)

Answer 18

Pars Flaccida

Question 19

Lower 2/3 (60mm)

Answer 19

Pars Tensa

Question 20

TM Layers

Answer 20

3 Layers (1/10 mm thick)
Epithelial proper layer , rich blood supply
Fibrous Layer
Mucus Membrane Layer

Question 21

TM is encircled by

embedded in fibrous portion by

Answer 21

Tympanic Annulus

Malleus Attachment

Question 22

Manubrium of Malleus points to:

Answer 22

1: 00 in Rt ear
11: 00 in Left ear

Question 23

The Umbo is

Answer 23

Tip of the Malleus, the area of greatest concavity

Question 24

Disorders of the Auricle

Answer 24

Microtia - small protruding - otoplasty

Anotia - Absent - plastic surgery

Question 25

Disorders of the EAC

Otic Atresia
Otic Stenosis

Answer 25

Absent

Narrowing surgical drillout

Question 26

Disorders of the EAC

Answer 26

Collapsing External Auditory Canal
Foreign Bodies
External Otitis (swimmers ear)

Question 27

More Disorders of the EAM
Otomycosis
Furunculosis
Osteomyelitits
Osteomas
Exostoses
Earwax

Answer 27

Fungal Infections
Allergic Reactions
Temporal Bone Inf
Malignant Bony Tumors
Benign Bone Growths
Ceruments

Question 28

Disorders of the TM

Answer 28

Perforations of the TM (myringoplasty & antibiotics)
Thickening of the TM - Tympanosclerosis meds & surg not good
Myringtisis - Viral infection of the TM – surg

Myringoplasty + ossicular reconstuction = tympanoplasty