Prosencephalon

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The forebrain or forebrain is a large area of the brain of vertebrates , which already during early embryogenesis is created.

Stages in the embryogenesis of the brain: the anterior neural tube initially develops into the anlage of the prosencephalon, mesencephalon and rhombencephalon (left half of the picture, approx. 5th week). The prosencephalon then differentiates into telencephalon and diencephalon (see right half of the picture), which then differentiate further (not illustrated).

The prosencephalon arises from the foremost part of the neural tube and further differentiates into

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.

See also