Ear: Amazing Numerical Facts

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

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Numerical Facts most Parts of Ear

Surface expanse of the tympanic membrane	85mm2
Length of the Eustachian tube	3.5 to 3.9 cm
Number of pilus cells inwards cochlea	3,500 inner pilus cells; 12,000 outer pilus cells
Number of fibers inwards auditory nerve	30,000
Length of auditory nerve	2.5 cm
Number of neurons inwards cochlear nuclei	8,800
Number of neurons inwards inferior colliculus	392,000
Number of neurons inwards medial geniculate body	570,000
Number of neurons inwards 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 yesteryear seven mm
Weight of stapes	3-4 mg
Dimensions of stapes	3.5 mm high, iii mm long, 1.4 mm wide
Length of cochlea	3.5 cm
Width of cochlea	1 cm

Sound scale inwards 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 attain 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

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