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1E

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emmetropia; energy; Escherichia; eye.

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2E

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In echocardiography, the initial velocity of blood flow through the opening mitral valve.

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e

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electric charge; electron; L. ex, out of.

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E1

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estrone.

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E2

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estradiol.

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E3

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estriol.

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ea

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each.

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EACA

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epsilon-aminocaproic acid.

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ead

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L. eadem, the same.

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EAEC

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enteroaggregative Escherichia coli.

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EAFUS

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Everything added to food in the United States.

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eAG

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Estimated average glucose.

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EAH

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Exercise-associated hyponatremia.

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Eales disease

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(ēlz) [Henry Eales, Brit. physician, 1852–1913] Recurrent hemorrhage into the retina and vitreous, most commonly seen in men in the second and third decades of life. The cause is unknown.

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ear

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(ēr) The organ of hearing and equilibrium. It consists of outer, middle, and inner portions, and it is innervated by the eighth cranial nerve. SEE: illus.

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Image not available.

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STRUCTURE OF THE EAR

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The pathway of hearing is as follows: the auricle funnels sound waves from the environment through the external auditory canal to the tympanic membrane, which makes this thin epithelial structure vibrate. The vibrations are transmitted to the auditory ossicles and then to the perilymph and endolymph. The receptors are part of the organ of Corti and generate impulses transmitted by the cochlear branch of the eighth cranial nerve to the spiral ganglion and auditory tracts of the brain. The auditory areas are in the temporal lobes.

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The healthy human ear responds to a variety of sounds, with frequencies ranging from about 20 to 20,000 Hz. It is most sensitive, however, to sounds whose frequencies fall in the 1500- to 3000-Hz range, the frequency range of most human speech. SEE: hearing.

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The receptors for equilibrium are in the utricle, saccule, and semicircular ducts, which are innervated by the vestibular branch of the eighth cranial nerve. Impulses from the utricle and saccule provide information about the position of the head, those from the semicircular ducts about the speed and direction of three-dimensional movement.

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cauliflower e. A thickening of the external ear resulting from trauma. It is commonly seen in boxers. Plastic surgery may restore the ear to a normal shape.

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external e. That part of the ear consisting of the auricle and external auditory canal, and separated from the middle ...

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