The walls of metencephalon form the pons and the cerebellum, while its cavity forms the cranial part of the fourth ventricle.
The cerebellum develops from thickenings of the alar plates, which enlarge and fuse. It overgrows and overlaps the pons and medulla. At the 8th developmental week, the cerebellum consists of the neuroepithelial, mantle and marginal layer. During the further development, it gradually differentiates into gray and white matter and the several nuclei.
The pons is the region of the brainstream and the site of the passage of the nerve fibers connecting the cerebral and cerebellar cortices. |
