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Cerebellum and Fourth Ventricle

Last Updated: February 5, 2020


The posterior cranial fossa, the largest and deepest of the three cranial fossae, contains the most complex intracranial anatomy. Here, in approximately one-eighth the intracranial space, are found the pathways regulating consciousness, vital autonomic functions, and motor activities and sensory reception for the head, body, and extremities, in addition to the centers for controlling balance and gait. Only 2 of the 12 pairs of cranial nerves are located entirely outside the posterior fossa; the 10 other pairs have a segment within the posterior fossa (22, 25) (Fig. 1.1). The posterior fossa is strategically situated at the outlet of the cerebrospinal fluid flow from the ventricular system. The arterial relationships are especially complex, with the vertebral and basilar arter...