Boundaries and Anatomical Relations of the Fourth Ventricle

The fourth ventricle is a crucial cerebrospinal fluid-filled cavity situated between the brainstem and cerebellum. It plays a vital role in connecting the central nervous system's ventricular system and facilitating CSF circulation.

Boundaries of the Fourth Ventricle

Roof

• Formed by the superior and inferior medullary velum.
• Cerebellar white matter contributes to the superior portion.

Floor

• Also known as the rhomboid fossa.
• Composed of the dorsal surfaces of the pons and medulla.

Side Walls

• Bounded laterally by the cerebellar peduncles.
• Inferiorly, extends into the central canal.

Anatomical Relations

The fourth ventricle maintains key anatomical relations with nearby structures:

• Anteriorly: Brainstem (pons and medulla).
• Posteriorly: Cerebellum.
• Inferiorly: Central canal extending into the spinal cord.
• Superiorly: Cerebral aqueduct connecting to the third ventricle.

Clinical Significance

Understanding the boundaries and anatomical relations of the fourth ventricle is crucial in neurology and neurosurgery. Pathological conditions affecting this region include hydrocephalus, tumors, and cerebrovascular disorders, often requiring surgical intervention.