This section shows the pons and the cerebellum, parts of the rostral hindbrain that border the fourth ventricle. The cerebellum is important in the control of movement. Much of the input to the cerebellar cortex derives from the pontine nuclei, while the output from the cerebellum is from neurons of the deep cerebellar nuclei. The reticular formation (from reticulum, Latin for 'net') runs from the midbrain to the medulla at the core of the brain stem, just under the cerebral aqueduct and fourth ventricle. One function of the reticular formation is to regulate sleep and wakefulness. A function of the pontine reticulate formation is to control body posture.

10. Pontine nuclei

11. Pontine reticular formation

12. Deep cerebellar nuclei

13. Cerebellar cortex

14. Fourth ventricle

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