Do lateral ventricles connect to the ambient cisterns?

[pzh200707]

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I'm just a medical student and feel strange about this pic.

Here are two pics from thieme- pocket atlas of sectional anatomy

 

[freelow_per7]

Hi pzh200707, I can see how you are concerned looking at that picture. It almost looks like retrothalamic part of that patient's quadrigeminal cistern is connected directly to his trigones. lol....and to make matters worse that animation incorrectly shows the lateral ventricle connected to the cisterns. The trigones of the lateral ventricles pass in close proximity to the quadrigeminal cisterns but they do not connect. If they did connect directly like that picture suggests then aqueductal stenosis would not be expected to cause significant hydrocephalus. The CSF in the lateral ventricles must first traverse the 3rd and 4th ventricles before reaching the cisterns.

 

[pzh200707]

Hi pzh200707, I can see how you are concerned looking at that picture. It almost looks like retrothalamic part of that patient's quadrigeminal cistern is connected directly to his trigones. lol....and to make matters worse that animation incorrectly shows the lateral ventricle connected to the cisterns. The trigones of the lateral ventricles pass in close proximity to the quadrigeminal cisterns but they do not connect. If they did connect directly like that picture suggests then aqueductal stenosis would not be expected to cause significant hydrocephalus. The CSF in the lateral ventricles must first traverse the 3rd and 4th ventricles before reaching the cisterns.

Thanks, freelow_per7. I'm totally confused by the animation and pics. It just "looks like" fistula between trigones and ambient cisterns. lol.... Can there be any pathologic condition where trigones connect the cisterns since they locate so close.