Primary and secondary brain vesicles

• The three primary brain vescicles are → prosencephalon, mesencephalon and rhombencephalon
• The primary brain vesicles have formed by the fourth week
• The secondary brain vesicles are → telencephalon, diencephalon, mesencephalon, metencephalon and myelencephalon
• procencephalon forms → telencephalon and diencephalon
• mesencephalon forms → mesencephalon
• Rhombencephalon forms → metencephalon and myelencephalon