Here is an amazing collection of Number Facts about your ear!
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Numerical Facts about Parts of Ear
Surface
area of the tympanic membrane
|
85mm2
|
Length of
the Eustachian tube
|
3.5 to 3.9 cm
|
Number of
hair cells in cochlea
|
3,500 inner hair cells; 12,000
outer hair cells
|
Number of
fibers in auditory nerve
|
30,000
|
Length of
auditory nerve
|
2.5 cm
|
Number of
neurons in cochlear nuclei
|
8,800
|
Number of
neurons in inferior colliculus
|
392,000
|
Number of
neurons in medial geniculate body
|
570,000
|
Number of
neurons in auditory cortex
|
100,000,000
|
Length of
external auditory meatus
|
2.7 cm
|
Diameter
of external auditory meatus
|
0.7 cm
|
Weight of
Malleus
|
23 mg
|
Length of
Malleus
|
8-9 mm
|
Weight of
Incus
|
30 mg
|
Dimensions
of Incus
|
5 mm by 7 mm
|
Weight of
stapes
|
3-4 mg
|
Dimensions
of stapes
|
3.5 mm high, 3 mm long,
1.4 mm wide
|
Length of
cochlea
|
3.5 cm
|
Width of
cochlea
|
1 cm
|
Sound scale in Decibel Unit
Soft whisper
30
Average home
50
Normal conversation
66
Busy traffic
75
Noisy Restaurant
80
Subway
90
Automobile horn
120
Discomfort
120
Pain threshold
130
Jet plane
140
Gunshot blast
140
Rocket launching pad
180
Hearing Range of Various Animals
Young adult human
20 to 20,000 Hz
Elderly human
50 to 8,000 Hz
Most sensitive range
of human hearing
1,000 to 4,000 Hz
Rat
1,000 to 50,000 Hz
Cat
100 to 60,000 Hz
Dolphin
200 to 150,000 Hz
Elephant
1 to 20,000 Hz
Goldfish
5 to 2,000 Hz
Moth, noctuid
1,000 to 240,000 Hz
Mouse
1,000 to 100,000 Hz
Sea lion
100 to 40,000 Hz
Soft whisper
|
30
|
Average home
|
50
|
Normal conversation
|
66
|
Busy traffic
|
75
|
Noisy Restaurant
|
80
|
Subway
|
90
|
Automobile horn
|
120
|
Discomfort
|
120
|
Pain threshold
|
130
|
Jet plane
|
140
|
Gunshot blast
|
140
|
Rocket launching pad
|
180
|
Hearing Range of Various Animals
Young adult human
|
20 to 20,000 Hz
|
Elderly human
|
50 to 8,000 Hz
|
Most sensitive range
of human hearing
|
1,000 to 4,000 Hz
|
Rat
|
1,000 to 50,000 Hz
|
Cat
|
100 to 60,000 Hz
|
Dolphin
|
200 to 150,000 Hz
|
Elephant
|
1 to 20,000 Hz
|
Goldfish
|
5 to 2,000 Hz
|
Moth, noctuid
|
1,000 to 240,000 Hz
|
Mouse
|
1,000 to 100,000 Hz
|
Sea lion
|
100 to 40,000 Hz
|
informative.......good attempt.
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