Brain Vesicles
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Brain Vesicle Formation
Key Points
- The neural tube differentiates into brain vesicles ("-cephalon")
- The earliest subdivisions of the brain have developed by the end of 4 weeks.
3 Primary Brain Vesicles
There are 3 primary brain vesicles:
- Prosencephalon
- Mesencephalon
- Rhombencephalon
5 Secondary Brain Vesicles at 5 Weeks
At 5 weeks, they further develop into the secondary brain vesicles, and there are 5 of them:
- The prosencephalon partitions into the telencephalon and diencephalon.
- The mesencephalon remains as the mesencephalon.
- The rhombencephalon partitions into the metencephalon and myelencephalon.