CAS BI 106 Lecture Notes - Lecture 19: Epiglottis, Ear Canal, Stem Cell
25 Mar 2017
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Document Summary
Feel the ridges and bumps from free nerve endings. Then goes to the thalamus where it filters the information. Third neuron cell body found in the thalamus. Projecting to the somatosensory cortex postcentral gyrus. Then nmj to the muscle fibers in that muscle. Multiple tracts go up to the brain versus single tract that goes to the brain. Phantom pain- pain associated with a body part that has been removed (amputated) The dendrites may have been cut, but the cell body and axon are still intact. Cns portions of pathway are intact, too! Axon to the spinal cord is still intact. Brain does not perceive lack of sensation. Cns pathway is shared between somatic and visceral. Combination of sensations come together to create accurate picture of discriminatory touch. Receptive field- area in which receptor can detect stimuli. Small- precise location and very sensitive, can fine tune its precise location.
