-Automatic Zoom Primal Pictures Ltd. 2010 Case studies Stephen, an 83-year-old m
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-Automatic Zoom Primal Pictures Ltd. 2010 Case studies Stephen, an 83-year-old man, had an incident that left him unable to speak or swallow for a week Stephen had suffer stroke that had affected part of his central nervous system Two months later, Stephen's speech and swallowing had recovered, but he had a continued loss of taste sensation on the left side of his tongue. 1. Which nerves are involved in camying taste sensation from the tongue? 2. Explain why you would test taste sensation on both anterior and posterior parts of the tongue. 3. Explain the route by which taste information is relayed from the taste buds on the left side of the tongue to the left cerebral cortex? 4. Based on your answer to question 3, state where a single lesion could be located to cause Stephen's symptoms?Explanation / Answer
1 Answer-
The nerve involved in carrying taste sensation is glossopharyngeal which innervates the posterior one-third part of the tongue. Where VII nerve responsible to carry the taste sensation in the anterior two-thirds of the tongue.
2 Answer- As I write above there is nerve supply to the tongue anterior as well as posterior. For posterior we have the glossopharyngeal nerve and for anterior we have VII nerve Which means we have sensory receptors on tongue both side that why we have sensation on both sides of the tongue.
We can test by the using different taste as follow to identify the taste sensation.
sweet- on the tip of the tongue
salt - on either side of the front of the tongue
sour- behind this
and bitter- way in the back.
3 Answer-
The which related taste buds on the left side of the tongue this comes under posterior part of the tongue. There is the supply of glossopharyngeal nerve from the brain. There are chances of problem or blockage in this nerve supply.
4- Answer- Stephens symptoms also showing the problem comes under the posterior parts of the tongue. Which also controlled by glossopharyngeal nerve. Stephens has improper signal sensation transform in this area. Stephens glossopharyngeal nerve got week or damage.
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