the membrane window of the cochlear and makes the fluid in the cochlear interchange. The fluid movement than generates a response in the hearing nerve‚ therefore creating sound. Diagram of the human ear: 5‚ Cochlear implants replace the function of the damaged parts of the ear. Signals made by the implant are sent directly via the auditory nerve to the brain‚ which recognises the signals commonly known as sound. 6‚ Light rays enter the eye through the cornea. The cornea’s refractive power
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there is a continual turnover of cells‚ some very rapidly replace in hours. The function of the neuron is to transmit impulses from their origin to their destination i.e. to the muscle that controls movements of the legs and cardiac function. The nerve fibres of a neuron are not actually joined together but have a minute gap called synapse and this transmit from one neuron to another and again to the central nervous system which is the main communication system of the body it receives and interpret
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information and then sends out messages that control body functions and actions. ("Brain" 561) According to Tether‚ the brain is divided into three main parts: the cerebrum‚ the cerebellum‚ and the brain stem. These parts‚ in turn‚ are largely made up of nerve cells‚ called neurons‚ and helper cells‚ called glia. Researchers have discovered that there may be as many as 100 billion neurons in the brain and a far greater number of glia‚ possibly as many as one trillion . Important discoveries throughout the
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consists of two parts‚ central and peripheral. The central nervous system of vertebrates (such as humans) contains the brain‚ spinal cord‚ and retina. The peripheral nervous system consists of sensory neurons‚ clusters of neurons called ganglia‚ and nerves connecting them to each other and to the central nervous system. These regions are all interconnected by means
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pressure. photoreceptor A specialized neuron able to detect‚ and react to light nociceptor A sensory receptor that sends signals that cause the perception of pain in response to a potentially damaging stimulus. thermoreceptor A nerve cell that is sensitive to changes in temperature A sensation is : A physical feeling or perception resulting from something that happens to or comes into contact with the body. A projection is: process by which the brain causes a sensation
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Carpal tunnel syndrome occurs when the median nerve‚ which runs from the forearm into the hand‚ becomes pressed or squeezed at the wrist. The median nerve controls sensations to the palm side of the thumb and fingers (although not the little finger)‚ as well as impulses to some small muscles in the hand that allow the fingers and thumb to move. The carpal tunnel‚ a narrow rigid passageway of ligament and bones at the base of the hand houses the median nerve and tendons. Thickening from irritated tendons
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Sensation: Intro Sensation is the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment. Perception is the process of organizing and interpreting sensory information enabling us to recognize meaningful objects and events. Bottom-up processing is the analysis that begins with the sense receptors and works up to the brain’s integration of sensory information. Top-down processing is information processing guided by higher-level
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References: [1] ‚”Nerve Grafting”‚ [2] www.google.com [3] www.cbsnews.com [4] http://www.smh.com.au/news/world/its-not-the-movies-says-bionic- [5] Woman/2006/09/15/1157827154967.html.. [6] http://www.abcnews.go.com/Health/
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Sense of Touch/Feeling The Skin Senses Consider the skin has remarkable versatility: It protects us against surface injury‚ holds in body fluids‚ and helps regulate body temperature. The skin also contains nerve endings that‚ when stimulated‚ produce sensations of touch‚ pain‚ warmth and cold. Like several other senses‚ these skin senses are connected to the somatosensory cortex located in the brain’s parietal lobes. The Somatosensory Cortex The skin’s sensitivity
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muscle contraction Introduction For a skeletal muscle fiber to contract‚ a stimulus must be applied to it. The stimulus is delivered by a nerve cell‚ or neuron. A neuron has a threadlike process called and axon that my run 91 cm or more to a muscle. A bundle of such fibers from man different neurons composes a nerve. A neuron that stimulates muscle tissue is called a motor neuron. The motor neuron branches into terminal structures called telodendria that come into close approximation with
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