sensitive perception of the differences of soundespecially sensitiveness to the quality and correctness of musical sounds

an ear for music; a violinist with a good ear.

have /keep one's ear to the ground, to keep well-informed about current trends; be shrewd or astute:
Because she had her ear to the ground, she made a large fortune in stock speculation.

;+

What Is Causing My Ears to Ring?

What Causes the Eardrum to Appear Red?

Types of Ear Infections +cold or the flu all ear infections are not created equal +

What is Ear Drainage and What Does it Mean?

+Answer: Ear drainage can be a sign of several conditions, depending on what type of fluid is coming from the ear.

When Is Ear Drainage a Medical Emergency?

+Answer: There are a few different types of ear drainage, including blood, clear or milky white liquid, and — most commonly — ear wax. Drainage may also be a sort of combination of the three.

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What is a Retracted Ear Drum? more info { http://ent.about.com/od/entdisorderspr/fl/What-Causes-a-Retracted-Ear-Drum.htm 

If a doctor has told you that you have a retracted ear drum you may be wondering what this means. Saying your ear drum is retracted is another way of saying that your ear drum, which is also called the tympanic membrane, appears to be sucked backwards or concave. Medical professionals may also call a retracted ear drum middle ear atelectasis. To understand the conditions that may cause this you must first understand a little bit about the ear drum and the normal physiology of the middle ear.

The ear drum is a thin piece of tissue, extending from the auditory tube, which separates the middle and inner ear from the external ear. The majority of the ear drum is stretched tightly across the auditory tube but other parts of the tympanic membrane are more flaccid. The ear drum has several functions including the transmission and amplification of sound waves and the protection of delicate ear structures. 

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The tympanic membrane-

Das Trommelfell + Tärykalvon +  La membrane tympanique

Definition: The tympanic membrane is the thin piece of tissue that separates the external structures of the ear from the middle and inner ear. Also called the eardrum, the tympanic membrane receives sound and carries the vibration to the tiny bones inside the ear.

Also Known As: Eardrum

Common Misspellings: timpanic membrane

Examples: Using a cotton swab to clean the ear can damage the tympanic membrane.

 

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links-++

http://ent.about.com/od/enttreatments/u/Surgeries-And-Other-Treatments-For-Disorders-Of-The-Ear-Nose-And-Throat.htm

______+elder +Adult ..

Tinnitus in Older People

Your Hearing and Aging 

+ Birth + after 20's -" 

Hearing Loss + 

Diagnosing Hearing Loss

There are many varying degrees and causes of hearing loss. In general, hearing loss is categorized by three basic types depending on the area of the ear or auditory system that is damaged.

particular type ” generally caused by damage from medications, birth injuries, or genetic factors. Less commonly this type of hearing loss can be caused by tumors, too much exposure to loud noises, head injuries, or other types of trauma. Sensorineural

http://ent.about.com/od/entdisordersgi/a/Hearing_Loss.htm

http://www.hearingloss.org/content/types-causes-and-treatment

https://en.wikipedia.org/wiki/Sensorineural_hearing_loss

http://www.webmd.com/healthy-aging/ss/slideshow-causes 

http://www.webmd.com/healthy-aging/causes?page=2

particular type “Hearing Loss damage from  birth injuries 

In about 25% of cases of hearing loss there is a non-genetic cause that can be identified. Non-genetic hearing loss is most often caused by illness or trauma before birth or during the birth process. Older infants and young children can also develop non-genetic hearing loss due to illness or trauma.

Some viral infections are known to be associated with hearing loss. These infections carry the highest risk of causing hearing loss if the mother has the illness during pregnancy or passes the infection to her baby

Hearing Loss at Birth

Some children are born with hearing loss. This is called congenital hearing loss. Though congenital hearing loss often runs in families, it can occur with maternal diabetes or an infection when pregnant. Hearing loss can also develop if a newborn is premature or from other causes such as trauma during birth resulting in the infant not getting enough oxygen. Neonatal jaundice may also be responsible for some cases of neonatal hearing loss.

http://www.babyhearing.org/hearingamplification/causes/nongenetic.asp

http://www.birthinjuryguide.org/birth-injury/

Hearing Loss damage from genetic factors

What Are the Most Common Forms of Genetic Hearing Loss?

Of the 50% of the genetic forms of hearing loss, an estimated 70% are due to recessive causes, about 15% have a dominant cause; and the remaining 15% include all the other forms of inheritance. more info+ Genetic 

 

particular type “Hearing Loss damage from medications

Medicines That Cause Hearing Loss

Ototoxic Medications (Medication Effects)

FollowWhat medications can cause hearing loss?

Dr. David Vernick, MD, Ear, Nose & Throat (Otolaryngology), answered
Several over-the-counter and prescription drugs can harm the nerves in the inner ear and can cause sudden hearing loss. In many cases, ringing in the ears or vertigo (dizziness) accompanies the hearing loss. With over-the-counter drugs, the problems are usually temporary. In most cases, normal hearing returns and the other symptoms go away several weeks after the medicine is stopped. Prescription drugs are more likely to lead to permanent changes in hearing.

Commonly used drugs that can affect hearing include:
Aspirin
Aminoglycosides, which include antibiotics such as gentamicin and amikacin
Cisplatin, a cancer-fighting drug
Diuretics such as ethacrynic acid and furosemide, which are used for hypertension
Quinine, the antimalaria drug
Quinidine, a drug for irregular heartbeat
A combination of hydrocodone and acetaminophen, a narcotic pain reliever
Drugs used to treat erectile dysfunction
Aspirin is a problem only when it’s taken too often or in too high a dose, but the other drugs can cause adverse reactions in the ear even when taken as directed. If you are concerned, ask your doctor if alternative drugs that don’t affect hearing are available, especially if you already have some hearing loss

particular type “Hearing Loss damage from Brain Injury

http://www.tsbvi.edu/seehear/summer02/ptvs.htm 

Tumors. Both cancerous and noncancerous tumors can cause severe hearing loss. This includes acoustic neuroma (vestibular schwannoma), paraganglioma, and meningioma. People who have a tumor might also have facial numbness or weakness and ringing in the ear.