aqua
Forum Senior
Topics: 25
Posts: 124
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which artery, in circle of willis,if damged causes mydriasis?posterior cerebral OR posterior communicating?????????
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| vanshita
Forum Guru
Topics: 26
Posts: 880
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posterior communicating?
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| Dr.Papez
Forum Senior
Topics: 0
Posts: 152
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it is not if damaged- aneurysm of PCOM produces 3rd nerve palsy.
PCA occlusion may produce third nerve palsy
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| waqastariq
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dear friend,
posterior communicating aneurysm that is usually 3-10% of all the cases produces compression of third nerve which is carrying it's parasympathetic nerve fibers in the periphery of the nerve ....these parasympathetic fibers relay in ciliary ganglion and then go through short ciliary nerves to constrictor pupillae (the circular muscle) ....the loss of this parasympathetic drive due to compression leads to unopposed sympathetic drive that is coming from the ciliospinal nucleas of Budge located at T1 and T2 level in the lateral horn of gray mater ...... through superior cervical ganglion and then through the ciliary ganglion through long ciliary nerves to the dilator pupilae leading to mydriasis (dilated pupil)
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| aqua
Forum Senior
Topics: 25
Posts: 124
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thanx alot guys
waqas....where are you from? pakistan?
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| waqastariq
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yups I am from pak drVirgo...
final year med student from rawalpindi med college... 
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| aqua
Forum Senior
Topics: 25
Posts: 124
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nice to know waqas...iam from rawalpindi too...
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