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Tuesday, 25 November 2014

HUMAN EAR: OUTER EAR, MIDDLE EAR, INNER EAR, HEARING

12:53 - 14 comments




The ear is the organ of hearing and balance in mammals.


Human Ear has receptors that are sensitive to the audible frequency range. The audible frequency range for a human ear is 20Hz – 20,000Hz. Human ear is deaf to vibrations which are below 20Hz or above 20,000Hz. This is the ideal range, but exact audible frequency range differs for each person. A young person may listen as low as 20Hz, but an old man may not. Age factor has lots of importance in the audible frequency range for a person. 

Structure of Human Ear:

Human ear consists of three parts.


  • Outer Ear
  • Middle Ear
  • Inner Ear



Outer Ear:

Outer ear is the outer part of the ear which is visible to us. This visible part is made up of cartilage confined by the skin known as the Ear pinna. Many vertebrates, like eyes, can move their pinna in order to focus on vibrations. Opening of the ear is a tube that leads inwards called the external auditory meatus. It has sebaceous organs that produce secretions. Ear tube collects sound energy and focuses it on the tympanic membrane (eardrum). The chief function of the outer ear is to direct sound waves toward the tympanic membrane. Outer ear also contains muscles which have little activity in humans as many mammals can move their ear to focus sound waves.

Middle Ear:

Middle ear is the part of the ear next to eardrum. Middle ear is an air filled pit which communicates with the nasal cavity (pit of nose) by a thin tube called Eustachian tube which allows the pressure to level between middle ear and throat. There are three bones in the middle ear known as incus, malleus and stapes that fits into the window-like opening in the bone of the brain that differentiates the middle ear from the internal ear. These three bones transmit the sound vibrations from the tympanic membrane (eardrum) into the inner ear. The chief function of the middle ear is to transmit sound waves from the tympanic membrane to the inner ear. Like outer ear, inner ear also has muscles and nerves.


Inner Ear:

Inner ear is the inner most part of ear. It is primarily concerned with detection of sound and balancing. The internal ear comprises the following parts. There are 3 semicircular channels having inflammation at one of their closures called the ampullae. These semicircular channels open into utricles, sacculus and a twisted cochlea.  

The auditory nerve which is originating from brain supplies many branches to the cochlea making its inward cells delicate to sound vibrations.  The three semicircular channel, utricles, sacculus and cochlea are jointly referred to as membranous labyrinth. The membranous labyrinth runs within the bony labyrinth. A fluid called perilymph is present between them and inside it, is an alternate liquid the endolymph containing certain calcareous particles.



Hearing:

The sound vibrations circulating in the atmosphere are directed into the external auditory meatus. These vibrations strike the tympanic membrane (eardrum) and make it to vibrate. The tympanic membrane transmits the vibrations to the three ossicles and then to the perilymph and the endolymph. The calcareous particles in the endolymph hit the responsive cells of the cochlea which is stimulated and sends impulses that go through the auditory nerve to mind and are deciphered as sound.

Balancing:

The membranous labyrinth (3 semicircular channels, utricles, sacculus and coiled cochlea) excluding cochlea have to do with balancing and posture. Any flaw in these causes wooziness. It is a basic experience that if an individual goes all around on a swing, he loses his balance and is not able to stand upright for quite a while until the balance is reinstated.

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14 comments:

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     through the internet, I saw a testimony on how Dr.Udebhu helped someone in curing his herpes disease using his healing
     Herbs, quickly I copied his email just to give him a test I spoke to him, he told me that he is going to provide the herbal cure to me, which he
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  5. I have been suffering from (HERPES) disease for the last four years and had constant pain, especially in my knees. During the first year, I had faith in God that I would be healed someday.This disease started to circulate all over my body and I have been taking treatment from my doctor, a few weeks ago I came on search on the internet if I could get any information concerning the prevention of this disease, on my search I saw a testimony of someone who has been healed from (Hepatitis B and Cancer) by this Man Dr. Silver and she also gave the email address of this man and advise we should contact him for any sickness that he would be of help, so I wrote to Dr. Silver telling him about my (HERPES Virus) he told me not to worry that I was going to be cured!! hmm i never believed it,, well after all the procedures and remedy given to me by this man few weeks later I started experiencing changes all over me as the Dr. assured me that I have cured, after some time i went to my doctor to confirmed if I have been finally healed behold it was TRUE, So friends my advice is if you have such sickness or any other at all you can email Dr. Silver (drsilverhealingtemple@gmail.com) sir I am indeed grateful for the help I will forever recommend you to my friends!!! with your lovely Email Address ( drsilverhealingtemple@gmail.com or whatsapp him on +2347032474849

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  7. Happiness is all i see now I never thought that I will be cured from HERPES virus again. I have been suffering from a deadly disease (HERPES) for the past 3 years now, I had spent a lot of money going from one places to another, from churches to churches, hospitals have been my home every day residence. Constant checks up have been my hobby not until this faithful day, I was searching through the internet, I saw a testimony on how DR agaba helped someone in curing his HERPES disease, quickly I copied his email which is Dragabasolutionhome@gmail.com just to give him a test I spoke to him, he asked me to do some certain things which I did, he told me that he is going to provide the herbal cure to me, which he did, then he asked me to go for medical checkup after some days after using the herbal cure, behold I was free from the deadly disease, he only asked me to post the testimony through the whole world, faithfully am doing it now, please brothers and sisters, he is great, I owe him in return. if you are having a similar problem just email him on : Dragabasolutionhome@gmail.com or WhatApp: +2349074536486  

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  8. Good day to all viewer online am so happy sharing this great testimony on how i was checking for solution in the internet then miraculously i came Across Dr.Aire the powerful herbalist that Cure Numerous individuals Herpes Simplex Virus,so I contacted him base on the testimonies I?m seeing about him on the internet, I was cured too by him, kindly contact him actoday through his email he can help you email ; drairehome@gmail.com OR WHATSAPP +2347036740271

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  10. All thanks to Dr KOKOBI for curing my herpes virus/hpv with his herbal medicine, i do not have much to say but with all my life i will forever be grateful to him and God Almighty for using Dr KOKOBI  to reach me when i thought it was all over, today i am happy with my life again after the medical doctor have confirmed my HERPES SIMPLEX VIRUS / HPV of 5 is gone. I never in my life believed that HERPES SIMPLEX VIRUS could be cured by herbal medicine. so i want to use this means to reach other persons who have this disease to know that all hope is not lost yet. contact him via kokobiherbalremedycentre@gmail.com or whatsapp +254746618873 and get your healing for any kind of disease. You can also call him via +2348114448587
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