Biology
Sound scale in Decibel Unit
- Particulars
CSF is born in the choroids plexus, into the lateral, third and fourth ventricles. It flows through the sub-Arachnoid spaces, and bathes the brain and spinal chord. CSF drains into the subarachnooid space via median and lateral apertures, located in...
- Amazing Facts About Brain And Neurons
AMAZING FACTS ABOUT NEURAL SYSTEM (BRAIN, SPINAL CORD AND NERVES) 1. Human neural system is made up specialized cells called neurons (nerve cells). 2. Rate...
- Neural Control And Co-ordination
NERVOUS (NEURAL) SYSTEM- Controls and coordinates the body activities. - Conducts and integrates the information.- Responses to stimuli. NeuronNeuron is the structural and functional...
- Skin And Hair Facts
A lifespan of an eyelash is approximately 150 days.A Russian man who wore a beard during the time of Peter the Great had to pay a special tax.A survey done by Clairol 10 years ago came up with 46% of men stating that it was okay to color their hair. Now...
- Your Ears Hear, But Can You Hear Your Ears?
The auditory mechanism is very smalOf your 10 or 11 senses (remember last week? ? sight, hearing, taste, smell, touch, hot, cold, pain, kinesthetic awareness, balance, and maybe proprioception), hearing and sight have the most complex mechanisms. This...
Biology
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
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
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
- Particulars
CSF is born in the choroids plexus, into the lateral, third and fourth ventricles. It flows through the sub-Arachnoid spaces, and bathes the brain and spinal chord. CSF drains into the subarachnooid space via median and lateral apertures, located in...
- Amazing Facts About Brain And Neurons
AMAZING FACTS ABOUT NEURAL SYSTEM (BRAIN, SPINAL CORD AND NERVES) 1. Human neural system is made up specialized cells called neurons (nerve cells). 2. Rate...
- Neural Control And Co-ordination
NERVOUS (NEURAL) SYSTEM- Controls and coordinates the body activities. - Conducts and integrates the information.- Responses to stimuli. NeuronNeuron is the structural and functional...
- Skin And Hair Facts
A lifespan of an eyelash is approximately 150 days.A Russian man who wore a beard during the time of Peter the Great had to pay a special tax.A survey done by Clairol 10 years ago came up with 46% of men stating that it was okay to color their hair. Now...
- Your Ears Hear, But Can You Hear Your Ears?
The auditory mechanism is very smalOf your 10 or 11 senses (remember last week? ? sight, hearing, taste, smell, touch, hot, cold, pain, kinesthetic awareness, balance, and maybe proprioception), hearing and sight have the most complex mechanisms. This...