Mesencephalon Midbrain

In the mesencephalon (Fig. 19.23), each basal plate contains two groups of motor nuclei: (a) a medial somatic efferent group, represented by the

Gray cortex
Mesencephalon Midbrain

Figure 19.21 Sagittal sections through the roof of the metencephalon showing development of the cerebellum. A. 8 weeks (approximately 30 mm). B. 12 weeks (70 mm). C. 13 weeks. D. 15 weeks. Note formation of the external granular layer on the surface of the cerebellar plate (B and C). During later stages, cells of the external granular layer migrate inward to mingle with Purkinje cells and form the definitive cortex of the cerebellum. The dentate nucleus is one of the deep cerebellar nuclei. Note the anterior and posterior velum.

Figure 19.21 Sagittal sections through the roof of the metencephalon showing development of the cerebellum. A. 8 weeks (approximately 30 mm). B. 12 weeks (70 mm). C. 13 weeks. D. 15 weeks. Note formation of the external granular layer on the surface of the cerebellar plate (B and C). During later stages, cells of the external granular layer migrate inward to mingle with Purkinje cells and form the definitive cortex of the cerebellum. The dentate nucleus is one of the deep cerebellar nuclei. Note the anterior and posterior velum.

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Figure 19.22 Stages in development of the cerebellar cortex. A. The external granular layer on the surface of the cerebellum forms a proliferative layer from which granule cells arise. They migrate inward from the surface (arrows). Basket and stellate cells derive from proliferating cells in the cerebellar white matter. B. Postnatal cerebellar cortex showing differentiated Purkinje cells, the molecular layer on the surface, and the internal granular layer beneath the Purkinje cells.

Figure 19.22 Stages in development of the cerebellar cortex. A. The external granular layer on the surface of the cerebellum forms a proliferative layer from which granule cells arise. They migrate inward from the surface (arrows). Basket and stellate cells derive from proliferating cells in the cerebellar white matter. B. Postnatal cerebellar cortex showing differentiated Purkinje cells, the molecular layer on the surface, and the internal granular layer beneath the Purkinje cells.

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