Final answer:
The pons and cerebellum are derived from the metencephalon, associated with the fourth ventricle.
Step-by-step explanation:
The pons and the cerebellum are derived from the metencephalon, a secondary vesicle of the embryonic brain which develops during the maturation of the rhombencephalon. The metencephalon later differentiates into these two important structures, where the pons serves as a critical bridge connecting the cerebellum and the brainstem. The cerebellum, known as the "little brain," plays a crucial role in motor control and accounts for about 10 percent of the brain's mass. Both the pons and cerebellum are associated with the fourth ventricle, which is situated between the pons and the cerebellum at the level of the brainstem.