Which derivatives are metencephalon and myelencephalon derived from?

Which derivatives are metencephalon and myelencephalon derived from?

• A. Prosencephalon
• B. Mesencephalon
• C. Rhombencephalon
• D. Spinal cord

Answer: (C)

In early brain development, the hindbrain is called the rhombencephalon. This structure later splits into two secondary vesicles: metencephalon and myelencephalon. The metencephalon becomes the pons and cerebellum, while the myelencephalon forms the medulla oblongata. So the derivatives metencephalon and myelencephalon come from the rhombencephalon. The other primary vesicles—the prosencephalon (forebrain) and the mesencephalon (midbrain)—do not give rise to these hindbrain structures, and the spinal cord is a separate neural-tube region, not a brain vesicle.

In early brain development, the hindbrain is called the rhombencephalon. This structure later splits into two secondary vesicles: metencephalon and myelencephalon. The metencephalon becomes the pons and cerebellum, while the myelencephalon forms the medulla oblongata. So the derivatives metencephalon and myelencephalon come from the rhombencephalon. The other primary vesicles—the prosencephalon (forebrain) and the mesencephalon (midbrain)—do not give rise to these hindbrain structures, and the spinal cord is a separate neural-tube region, not a brain vesicle.