new_n_lost
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A patient develops an excruciatingly painful infection of the anterior half of the external ear canal.
Which of the following nerves transmits this impulse?
A. Auricular branch of the vagus
B. Auriculotemporal nerve
C. Greater auricular nerve
D. Lesser occipital nerve
E. Vestibulocochlear nerve
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| Jackofknives
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A
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| alain
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B. Auriculotemporal nerve
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| Jackofknives
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Darn it. B is right
Edited by Jackofknives on 04/15/07 - 06:52 AM
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| new_n_lost
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"never argue with a fool, they'll bring you down to their level and beat you with experience" FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| new_n_lost
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The correct answer is B.
The ear has a complex sensory nerve supply, which includes all of the nerves listed. A consequence of this complexity is that pain actually originating in other sites (teeth and sinuses are notorious) may be misinterpreted as ear pain or (less commonly) pain originating in the ear may be misinterpreted as arising from other sites. The anterior half of the external ear canal is supplied by the auriculotemporal nerve, which also supplies the facial surface of the upper part of the auricle.
The auricular branch of the vagus (choice A) supplies the posterior half of the external ear canal.
The greater auricular nerve (choice C) supplies both surfaces of the lower part of the auricle.
The lesser occipital nerve (choice D) supplies the cranial surface of the upper part of the auricle.
The vestibulocochlear nerve (choice E) supplies hearing and motion sense.
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"never argue with a fool, they'll bring you down to their level and beat you with experience" FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| Jackofknives
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Btw a side note. Infection of the external acusticus meatus is very very rare, often due to severe infection of auris media and the subsequent tearing of tympany membrane, as a result pus flow to the external ear canal.
Most common type of ear infection is in the auris media, resulting in pressure to the tympany membran, thus causing pain. There is no way, from my judgement, that a patient can distinquish which part of the ear canal he/she is feeling pain, whether anterior or posterior.
Auris media is innervated by n. tympanicus n. hypoglossus. Tympany membrane is innervated by n. auricularis n. vagi.
my 2 cents
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| new_n_lost
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Jack whts the nerve supply to the Outer Ear thats the questions asks.
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"never argue with a fool, they'll bring you down to their level and beat you with experience" FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| Jackofknives
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yea i figured, then they should ask the question directly instead of confusing ppl. anyways, ill stop whinning. Nevertheless, NNL, I appreciate that you post all those questios.
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| new_n_lost
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lol buddy u arent whinig seriously its good to have positive discussions n its always good to post answer whether u have got them right or not its a educational process not a competition whether how many got right atleast u have the courage to try questions n thts gonna build u ur confidence level. U r going to get many questions like this in the real exm so better get use to them.
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"never argue with a fool, they'll bring you down to their level and beat you with experience" FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| Jackofknives
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I can agree more NNL.
Also, i just asked an ENT affiliated professor, he said infection in external acoustic meatus is more common in people who swim in "dirty" water, such as people comming home from a vacation where they swam in the sea, lake or alike.
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