Cerebral aqueduct

The cerebral aqueduct, also known as the aqueduct of Sylvius, is a narrow channel located within the brain that connects the third and fourth ventricles. It is a part of the ventricular system and plays a crucial role in the circulation of cerebrospinal fluid (CSF).

Anatomy

The cerebral aqueduct is a small, cylindrical, and narrow canal approximately 15 to 20 millimeters in length and 2 millimeters in diameter. It is located in the midbrain, specifically in the tegmentum, and runs from the posterior end of the third ventricle to the anterior end of the fourth ventricle.

Function

The primary function of the cerebral aqueduct is to allow the passage of CSF from the third ventricle, located in the midbrain, to the fourth ventricle, located between the pons and cerebellum. This ensures the continuous circulation of CSF throughout the brain, which is essential for the protection and nourishment of the brain.

Clinical Significance

Blockage or narrowing of the cerebral aqueduct can lead to a condition known as hydrocephalus, which is characterized by an excessive accumulation of CSF in the brain. This can cause increased intracranial pressure, leading to symptoms such as headaches, nausea, vomiting, and in severe cases, cognitive impairment and physical disability. Treatment typically involves the surgical insertion of a shunt to drain the excess fluid.

See Also

• Ventricular system
• Cerebrospinal fluid
• Hydrocephalus
• Third ventricle
• Fourth ventricle

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  Diagram of the oculomotor nerve nucleus
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  Transverse section of mid-brain at level of inferior colliculi
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  Section of the mid-brain at the level of the superior colliculi
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  Section of the mid-brain at the level of the inferior colliculi
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  Section of the mid-brain at the level of the superior colliculi
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  MRI showing the periaqueductal gray
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  Transverse section of mid-brain at level of superior colliculi
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  Transverse section of mid-brain at level of inferior colliculi
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  Cerebral aqueduct
• Cerebral aqueduct
  Cerebral aqueduct
• Cerebral aqueduct
  Cerebral aqueduct
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