Lateral Recess Of The Fourth Ventricle Of The Ventricles (Posterior View)

Description

Lateral recess of the fourth ventricle extends laterally from the ventricular cavity along the dorsolateral medulla and caudal pons, directed toward the cerebellopontine angle in a posterior (dorsal) perspective. The recess sits inferior to the cerebellar hemispheres and adjacent to the inferior cerebellar peduncle, with the ventricular roof formed by the inferior medullary velum and tela choroidea. At its lateral margin, the recess narrows toward the foramen of Luschka (lateral aperture), the point where cerebrospinal fluid exits the ventricular system into the subarachnoid space near the flocculus. Midline landmarks of the fourth ventricle remain medial, while the recess draws attention to the lateral gutter where ventricular and cisternal spaces meet. CSF outflow at the lateral apertures is a practical teaching focus when explaining noncommunicating hydrocephalus and the pressure dynamics that follow obstruction at the fourth ventricle, aqueduct, or outlets. The cerebellopontine angle is also a high traffic surgical corridor, and appreciating how the lateral recess approaches this region helps orient relationships to the flocculus, lower cranial nerves, and nearby vascular loops such as AICA and PICA that can contribute to neurovascular compression syndromes. Fixed posterior lighting and separation of ventricular cavity from surrounding brainstem and cerebellum make the aperture region easier to localize than in generalized hindbrain views. A tight space. Use this illustration for neuroanatomy lectures on the ventricular system, CSF circulation, and subarachnoid cisterns, or for neurosurgical and neuroradiology materials discussing fourth ventricular outlet obstruction, Dandy Walker spectrum, and posterior fossa approaches to lesions near the cerebellopontine angle. Anatomical accuracy verified by SciePro's Medical Advisory Board.