Cerebral aqueduct (of Sylvius)

The cerebral aqueduct (of Sylvius) is the structure within the brainstem that connects the third ventricle to the fourth. It is located within the midbrain, surrounded by periaqueductal grey matter (PAG) with the tectum of midbrain located posteriorly and the tegmentum anteriorly.

It is filled with CSF and its obstruction leads to obstructive hydrocephalus with dilatation of the lateral and third ventricles only. 

Related pathology

See also

Anatomy: Brain

Anatomy: Brain

Article information

rID: 5779
Section: Anatomy
Synonyms or Alternate Spellings:
  • Central aqueduct (of Sylvius)
  • Aqueduct of Sylvius
  • Cerebral aqueduct

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Figure 1: ventricular system
    Drag here to reorder.
  • Figure 2: brain (sagittal section)
    Drag here to reorder.
  • Figure 3: midbrain (level of superior colliculi)
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.