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20 Cards in this Set
- Front
- Back
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auditory nerve
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is the nerve that receives sound wave messages from the receptor cells in the cochlea and sends them to the auditory portion of the brain.
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cochlea
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is the snail shaped structure in the inner ear filled with fluid. it is pea size and contains receptor cells. when the fluid in the cochlea moves it trigers receptor cells
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decibals
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units of sound measurement.
ex:loud ipod=125 decibals ex:whisper=30 decibals |
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auditory canal
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the sound waves are funneled through the pinna and travel into the middle part of the ear through a tube called________.
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ear infection
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an _______ occurs in the ear canal and is referred to as swimmers ear and can be caused by fungus or bacteria. a middle ear infection is generally caused by bacteria which travels up the Eustachian tube. Inner ear infection~virus that dmamges the semicircular canals causing partial or complete hearing loss.
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tympanum
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at the end of the auditory canal and stretched tight like the head of a muscle drum and it vibrates causing three three small bones to vibrate. it separates the outer ear from the inner ear.
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Eustachian tube
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between your middle ear and your throat there is a passage called the ________ keep pressure from building by letting air move in and out of your middle ear. (one on each side)
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incus
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the _______ is the second bone in the middle ear that receives sound wave messages in the form of vibrations from the malleus and send it to the third tiny bone in the stapes.
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inner ear
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is totally encased in the skull the inner ear is filled with fluid
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malleus
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is the first of three bones in the middle ear it receives sound wave messages in the form of vibrations from the eardrum and sends them to the incus
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nerves
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are made up of bundles of neurons. Certain nerves carry messages to the spinal cord brain. other nerves carry messages from the brain nerves tend to be larger at the spinal cord and smaller as the move away from the spinal cord.
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nervos system
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the _______ is made up of the brain spinal cord nerves and sense organs . It receives messages from the enviorment and sends them to the brain and sends the messages from the brain to the body
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neurons
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are the special name for nerve cells. Nerve cells make up the brain nerves and spinal cord. They send messages to and from the brain.
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piamater
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is the most delacite innermost layer of the meanings the membranes surrounding the brain and the spinal cord. The thin mesh like pia mater closley covers the entire surface of the brain running down into the folds of the cerbrum
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receptor cells
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are specialized neurons in the sense organs that detect stimuli from the enviorment like light smells sounds ect. (eyes nose ears)
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reflex
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is an action controlled by a message carried by a nerve that goes to the spinal cord not the brain. this saves time and allows action to occur quickly. ex: blinking and pulling a hand away from a stove
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sense organs
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ex:eyes nose ears. have specialized cells that pick up messages from the enviorment and sends the messages to the brain
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spinal cord
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is formed by a narrowing of medulla it is made of nerves that carry messages to or away from the brain it runs down a channel created by the hollow centers of the vertebrae
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synapse
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are where neurons meet. the dendrites and the axons dont actully touch because the synapses are tiny gaps. At the synapses the nerve signal can jump from one to the next. the dendrites receive nerve signals from other nerve cells and pass them to the axon. the dendrites of other nerve cells. At the synapse the signals always pass in the same direction they dont work in reverse
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terminal fibers
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are located at the end of axons. They release molecules that the dendrites of a nearby neuron receives.
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