Answer
The mesencephalon does develop into secondary brain vesicles.
Work Step by Step
In contrast, both the prosencephalon and the rhombencephalon develop secondary brain vesicles.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.