Prepontine cistern

Anatomical space in the brain

The prepontine cistern is a cerebrospinal fluid-filled space located in the brainstem region, specifically anterior to the pons. It is an important anatomical structure that plays a role in the circulation of cerebrospinal fluid (CSF) and is relevant in various medical conditions and procedures.

Anatomy

The prepontine cistern is situated in the posterior cranial fossa, anterior to the pons and posterior to the clivus. It is bordered superiorly by the interpeduncular cistern and inferiorly by the medullary cistern. The cistern is part of the subarachnoid space, which is the area between the arachnoid mater and the pia mater.

Diagram of the brainstem showing the prepontine cistern

The prepontine cistern contains several important structures, including the basilar artery, which is a major blood vessel supplying the brain. It also contains the abducens nerve (cranial nerve VI) as it travels to the cavernous sinus and the trigeminal nerve (cranial nerve V) as it exits the brainstem.

Function

The primary function of the prepontine cistern is to facilitate the flow of cerebrospinal fluid around the brainstem. CSF is produced in the choroid plexus of the ventricular system and circulates through the subarachnoid space, providing cushioning and protection to the brain and spinal cord.

Clinical significance

The prepontine cistern is of clinical importance in several contexts:

• Subarachnoid hemorrhage: Blood can accumulate in the prepontine cistern in cases of subarachnoid hemorrhage, which can be detected using computed tomography (CT) or magnetic resonance imaging (MRI).

• Basilar artery aneurysm: Aneurysms of the basilar artery can project into the prepontine cistern, potentially compressing adjacent structures and causing neurological symptoms.

• Trigeminal neuralgia: Compression of the trigeminal nerve in the prepontine cistern by vascular structures can lead to trigeminal neuralgia, a condition characterized by severe facial pain.

• Surgical approaches: The prepontine cistern is accessed in certain neurosurgical procedures, such as those involving the removal of tumors or the treatment of vascular lesions.

Imaging

The prepontine cistern can be visualized using various imaging modalities. MRI is particularly useful for detailed visualization of the cistern and its contents, allowing for the assessment of any pathological changes.

Diagram showing the location of the prepontine cistern in relation to other brain structures

Related pages

• Cistern (neuroanatomy)
• Subarachnoid space
• Basilar artery
• Pons
• Cerebrospinal fluid