Definitions for "Forebrain"
The anterior of the three principal divisions of the brain, including the prosencephalon and thalamencephalon. Sometimes restricted to the prosencephalon only. See Brain.
The most anterior part of the three regions of the embryonic brain.
The most anterior of the three brain vesicles that arise from the neural tube early in brain development. Also, the adult brain region that arises from the forebrain vesicle. The forebrain consists of the telencephalon and diencephalon.