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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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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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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Electromyography In this experiment‚ you will explore the electrical activity of skeletal muscle by recording an electromyogram (EMG) from a volunteer. You will examine the EMG of both voluntary and evoked muscle action and attempt to measure nerve conduction velocity. Written by staff of ADInstruments. [pic] Background A skeletal muscle fiber is innervated by a branch of a motor axon. Under normal circumstances‚ a neuronal action potential activates all of the muscles innervated by
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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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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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The electrical indications begin when unique receptor cells‚ on the ends of peripheral nerve fibers‚ know that injury or damage is taking place. The peripheral nervous system is the portion of the nervous system that contains the nerves and ganglia outside of the brain and spinal cord. These receptor cells give out their cautionary indications along the peripheral nerve fibers‚ which then transmit the signal to the dorsal horn of the spinal cord‚ which is the main highway for
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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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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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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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