Outer ear

Question 1

Pinna (auricle)

Answer 1

Outer, visible part of the ear
Aesthetic function only
Cartilage, skin, and muscles

Question 2

Extrinsic

Answer 2

Pinna muscles connect pinna to the head

Question 3

Intrinsic

Answer 3

Pinna muscle are small muscles within the pinna

Question 4

External Auditory Meatus (EAM)

Answer 4

Also call external auditory canal (EAC) 
Two bends that help the protection of the ear drums 
2-3 cm in length
6-8cm in diameter
First 1/3 of canal is cartilage
Last 1/3 is the bone portion

Question 5

External Auditory Meatus (EAM) Cartilaginous

Answer 5

Hair follicles (Cilia)
Sebaceous glands ( produce oil)
Cerumenous glands ( mix with oil become ear wax )

Question 6

What does the ear canal do ?

Answer 6

Protects ear drums 
Acoustic function (acts like a resonant tube)

Question 7

Closed-open ear canal tube

Answer 7

Sound changes in the tube before it gets to the eardrum
Certain frequencies are amplified
Ear canal act like little hearing aids and boost small sounds like /s/

Question 8

What is the range of Hz critical for hearing speech sounds?

Answer 8

Low frequencies: vowels are approx. 250-600Hz
High frequencies: fricatives are approx. 3000-4000Hz and are very soft
Ear canal give us boost where the softest sounds are being made

Question 9

Sounds

Answer 9

Fluctuation in air pressure around a null that probated through a medium. ( capable of giving rise to hearing )