Cerebral aqueduct

The mesencephalic duct, also known as the aqueduct of Sylvius or the cerebral aqueduct, contains cerebrospinal fluid (CSF), is within the mesencephalon (or midbrain) and connects the third ventricle in the diencephalon to the fourth ventricle, which is between the pons and cerebellum.

A blockage in this duct is a cause of hydrocephalus.

Images courtesy of RadsWiki

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  Fetal MRI: Aqueductal stenosis
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  Fetal MRI: Aqueductal stenosis
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  Fetal MRI: Aqueductal stenosis
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  Fetal MRI: Aqueductal stenosis
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  Fetal MRI: Aqueductal stenosis

• List of regions in the human brain

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  Coronal section through mid-brain.
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  Transverse section of mid-brain at level of inferior colliculi.
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  Transverse section of mid-brain at level of superior colliculi.
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  Median sagittal section of brain.
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  Scheme showing relations of the ventricles to the surface of the brain.
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  Drawing of a cast of the ventricular cavities, viewed from the side.

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