Saturday, April 5, 2014

Ear: Amazing Numerical Facts

Here is an amazing collection of Number Facts about your ear!



Do you want to get other Ear Facts? Click Here 

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


Do you want to get other Ear Facts? Click Here

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