Final answer:
The metencephalon develops into the pons and cerebellum, which are key adult brain structures. The cerebellum, known for motor control and coordination, is strongly connected to the pons, and together they contribute to the larger brain stem region in the adult brain.
Step-by-step explanation:
The adult derivatives of the wall of the metencephalon include the pons and the cerebellum. During embryonic development, the rhombencephalon divides into the metencephalon and myelencephalon. The metencephalon then differentiates into the pons and cerebellum, two critical structures of the adult brain. While the cerebellum, which makes up about 10 percent of the brain's mass, is involved in various functions including motor control, coordination, and balance, the pons serves as a significant connection between the cerebellum and other parts of the brain.
The cerebellum originates from the metencephalon and is noted for its large white matter connection to the pons, which is also derived from the metencephalon. This development highlights the strong connection between these two structures throughout their formation and into their function within the adult brain. The metencephalon is part of the secondary vesicle stage of brain development which eventually forms influential regions in the adult brain, including the brain stem composed of the midbrain, pons, and medulla oblongata.