The Endocrine System Essays

653 Words Feb 6th, 2013 3 Pages

TUI University
Montest Bumpers
Module 5 Case Assignment
Anatomy and Physiology
Professor Karmardi Mills
December 17, 2012
What happens with a patient who develops a cataract?
How does cataract formation represent a variance from normal anatomy & physiology?
What happens in sensorineural hearing loss?
How does sensorineural hearing loss represent a variance from normal anatomy & physiology?

For years now researchers believed that cataracts are developed because the proteins in the eye change as people age. The changes in these proteins cause the lens to become cloudy. Smoking, poor nutrition, eye injury, exposure to excessive sunlight, and certain
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The reason is that the light passing through the cloudy lens is distorted before it reaches the visual receptors in the retina on the inside rear of the eyeball.

If you want to understand hearing loss you must first know the anatomy of the ear. The ear has three parts the outer, middle, and inner ear. In the outer ear you have the pinna or auricle which collects and funnels sound into the ear canal. In the middle ear you have the eardrum or tympanic membrane where sound is changed into vibrations, three small bones the malleus, incus, and stapes transfer vibrations to the inner ear, lastly you have the inner ear where the cochlea which contains fluid and highly sensitive hair cells, the vestibular nerve which senses sound, rotation and gravity essential for balance and movement more importantly it carries impulses for equilibrium and the cochlear branch carries impulses for hearing.
Sensorineural hearing loss, occurs when the sensory cells of the cochlea or the auditory nerve fibers are dysfunctional. The sound wave is not capable of being transformed inside the cochlea to nervous stimuli. Some examples of sensorineural hearing loss are loud noises, and the most common is age induced hearing loss. Studies have shown that 90 percent of all hearing loss is sensorineural in nature. A sensorineural loss often affects a person’s ability to hear certain frequencies more than

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