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06.06 Nervous System

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joshua lee

on 27 February 2013

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Transcript of 06.06 Nervous System

Joshua Lee 06.06 Nervous System Scenario Summary A loud crashing sound causes everyone in the room to quickly turn their heads toward the source of the noise. Describe the path of the signal through the human nervous system from initial stimulus of sound to the response of turning the head. The loud sound, which is the initial stimulus, travels as sound waves and enters the ear. The sound is then registered by the cochlea and is sent through the auditory nerve too the brain First Step The signal from the ear is then sent to the brain's inferior colliculus and then to the thalamus. The thalamus registers the auditory signal and sends it to the auditory cortex. The auditory cortex then process the pitch and the frequency of the sound. Second step Once the sound is registered, the inferior colliculus, which is in charge of auditory reflexes, sends an impulse through the interneurons that reach the motor neurons that control the neck muscles. Once signaled the muscles contract and relax, so that the individual turns towards the loud noise. Third Step The process of the reflex of an individual turning their head to the direction of a loud noise takes no longer than several milliseconds after the initial stimulus. Yet the signal has to pass through the cochlea, the auditory nerve, the inferior colliculus, the thalamus, the auditory cortex, back to the inferior colliculus, and to the muscles that control the neck. Structure of the ear Sound waves Inferior Colliculus Thalamus Auditory Cortex Works Cited Page Longitudinal Wave- http://www.passmyexams.co.uk/GCSE/physics/basic-waves-theory.html Auditory Nerve- http://hyperphysics.phyastr.gsu.edu/hbase/sound/anerv.html Inferior Colliculus-http://www.drcink.net/nerveterms.htm Thalamus-http://www.psycheducation.org/emotion/R%20complex.htm Auditory Cortex-http://en.wikipedia.org/wiki/File:Primary_auditory_cortex.PNG Reflex Pathway-http://csmbio.csm.jmu.edu/biology/danie2jc/reflex.htm
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