Which of the following correctly pairs a brain structure with its embryonic origin?

• A. Thalamus — Telencephalon
• B. Midbrain — Mesencephalon
• C. Cerebellum — Telencephalon
• D. Medulla — Telencephalon

Answer: (B)

Understanding embryonic brain vesicles helps connect adult structures to theirOrigins. The brain forms from three primary vesicles: forebrain (prosencephalon), midbrain (mesencephalon), and hindbrain (rhombencephalon). The forebrain further splits into telencephalon and diencephalon, while the hindbrain becomes metencephalon and myelencephalon. The midbrain remains as the mesencephalon and gives rise to its characteristic midbrain structures. So the correct pairing is midbrain with mesencephalon because that middle vesicle remains as the midbrain, whereas the thalamus comes from the diencephalon, the cerebellum from the metencephalon, and the medulla from the myelencephalon.