Anatomical description of the fourth ventricle is essential for an accurate understanding of its related tumoral pathologies and surgical approach respecting cerebellar and brainstem structures. Numerous cadaver pictures illustrate this chapter which contains V4 floor and roof description and its vascularization.
Keywords: Anatomy; Floor of the fourth ventricle; Posterior inferior cerebellar artery; Roof of the fourth ventricle; Telovelar approach.
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