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   "1.The principal projecting part of the ear. Also called the pinna.2. Something ear shaped such as the upper chambers of the heart. Also called the atria.


The hearing organ. There are three sections of the ear, according to the anatomy textbooks. They are the outer ear (the part we see along the sides of our head behind the temples), the middle ear, and the inner ear. But in terms of function, the ear has four parts: those three and the brain. Hearing thus involves all parts of the ear as well as the auditory cortex of the brain. The external ear helps concentrate the vibrations of air on the ear drum and make it vibrate. These vibrations are transmitted by a chain of little bones in the middle ear to the inner ear. There they stimulate the fibers of the auditory nerve to transmit impulses to the brain.

The hollow, muscular organ responsible for pumping blood through the circulatory system.

The upper chambers of the heart that receive blood from the veins and pass it to the lower chambers of the heart.


Of or pertaining to the outer ear. Adjective form of auricle. (Not to be confused with avuncular which refers to an uncle).


Auditory disease, central
"A condition in which there is an inability to differentiate, recognize or understand sounds while both the hearing and intelligence are normal. The problem is ""central"" as regards the auditory pathways. (In technical terms, a central auditory processing disorder is a disease of the auditory pathways from the bulbar cochlear nuclei to the auditory cortex in the temporal lobe. Structures involved in such a disorder may include the medial and lateral lemnisci, inferior colliculus, and the medial geniculate nucleus.)"

Auditory integration training
An experimental procedure for reducing painful hypersensitivity to sound. It has proved beneficial for some people with autism and other neuropsychiatric disorders.

Auditory perception
The ability to identify, interpret, and attach meaning to sound.

Auditory prosthesis
A device that enhances the ability to hear or substitutes for it. More commonly called a hearing aid. See: Hearing aid.

Auditory tube
The tube that runs from the middle ear to the pharynx, also known as the Eustachian tube.


Of or pertaining to the outer ear. Adjective form of auricle. (Not to be confused with avuncular which refers to an uncle).

Austin Flint murmur
A murmur due to aortic regurgitation, originating at the mitral valve when blood enters simultaneously from both the aorta and the left atrium.

Autistic savant
A person with autism who is exceptionally gifted in a specialized field. That field may, for example, be mathematics. The autistic savant may be able to do rapid, complex mental calculations. Or the field may be music. The autistic savant may be able to perform a entire piece of music after hearing it only once.

1. Native. Poison ivy is an autochthonous plant. 2. Found in the place where it formed. As an autochthonous thrombus. 3. From the same individual. As an autochthonous graft. Or autochthonous lymphocytes. Autochthonous is the adjective and autochthon is the noun.

A chamber for sterilizing with steam under pressure. The original autoclave was essentially a pressure cooker. The steam tightened the lid.

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