Trọng lượng cơ quan thính giác ( theo gram)

SOURCE: http://fc.units.it/ppb/neurobiol/neuroscienze%20per%20tutti/facts.html

Audition

Number of hair cells in cochlea = 3500 inner hair cells; 12-20,000 outer hair cells
Number of fibers in auditory nerve = 28,000-30,000
Number of neurons in medial geniculate body = 570,000
Number of neurons in auditory cortex = 100,000,000
Hearing Range (young adult human) = 20 Hz to 20,000 Hz
Hearing Range (rat) = 1,000 to 50,000 Hz
Hearing Range (cat) = 100 to 60,000 Hz
Most sensitive range of human hearing = 1,000-4,000 Hz
Length of external auditory meatus = 2.7 cm
Diameter of external auditory meatus = 0.7 cm
Weight of malleus = 23 mg
Weight of incus = 25 mg
Weight of stapes = 2-4 mg
Length of cochlea = 35 mm
Width of cochlea = 10 mm
Number of turns in the cochlea = 2.2-2.9
Length of basilar membrane = 25-35 mm
Auditory Pain Threshold = 130 db
Threshold for hearing damage = 90 db for an extended period of time

         	 Decibel Sound Scale
            ----------------------------
	  Decibles	     Sound
  	  --------	---------------
	    160		Jet plane engine
	    130		Pain threshold
	    120		Discomfort
	    100		Subway
	     80		Heavy motor vehicle traffice
	     60		Normal conversation
	     20		Whisper conversation
              0		Threshold of hearing

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