Archive image from page 403 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 392 THE CEREBELLUM The Development of the Metencephalon and Isthmus.—Our knowl- edge of the development of the metencephalon, isthmus, and mesen- cephalon is by no means as complete as is that of the myelencephalon. The pons develops as a thickening of the portion of the brain floor which forms the anterior wall of the pons flexure, and its transverse fibers are well developed by the fourth month (Mihalkovicz), but all details regard
Archive image from page 403 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 392 THE CEREBELLUM The Development of the Metencephalon and Isthmus.—Our knowl- edge of the development of the metencephalon, isthmus, and mesen- cephalon is by no means as complete as is that of the myelencephalon. The pons develops as a thickening of the portion of the brain floor which forms the anterior wall of the pons flexure, and its transverse fibers are well developed by the fourth month (Mihalkovicz), but all details regarding the origin of the pons nuclei are as yet wanting. If one may argue from what occurs in the myelencephalon, it seems probable that the reticular formation of the metencephalon is derived from the ventral zone, and that the median raphe represents the floor-plate. Furthermore, the relations of the pons nuclei to the reticular formation on the one hand, and its connection by means of
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