Prosencephalon
The forebrain or forebrain is a large area of the brain of vertebrates , which already during early embryogenesis is created.
![](https://upload.wikimedia.org/wikipedia/commons/thumb/5/54/EmbryonicBrain.svg/langde-220px-EmbryonicBrain.svg.png)
The prosencephalon arises from the foremost part of the neural tube and further differentiates into
- Telencephalon (endbrain) and
- Diencephalon (interbrain).
Anatomists and neuroscientists usually use the terms forebrain and cerebrum in a differentiated manner , whereby the term “cerebrum” then means parts of the telencephalon .
The combination of telencephalon and diencephalon to form the prosencephalon results from the functional relationships as well as from the embryology and the tribal history . In chordating , the brain arises from the anterior parts of the neural tube . They form - as characteristic features - brain areas in which the chemoreceptive (of the olfactory sense, olfactory ) and photoreceptive (of the visual sense , optical ) sense organs are represented, in the telencephalon or in the diencephalon.
The regionally different growth processes of the anterior neural tube initially lead to a stage with two cerebral vesicles , then to the 3-vesicle stage with the prosencephalon as the anterior, mesencephalon as the middle and rhombencephalon as the rear of the (primary) cerebral vesicles.