AskDefine | Define forebrain

Dictionary Definition

forebrain n : the anterior portion of the brain; the part of the brain that develops from the anterior part of the neural tube [syn: prosencephalon]

User Contributed Dictionary



  1. The anterior part of the brain, including the cerebrum, thalamus, and hypothalamus.



part of the brain

Extensive Definition

In the anatomy of the brain of vertebrates, the prosencephalon (or forebrain) is the rostral-most (forward-most) portion of the brain. The prosencephalon, the mesencephalon (midbrain), and rhombencephalon (hindbrain) are the three primary portions of the brain during early development of the central nervous system.
At the five-vesicle stage, the prosencephalon separates into the diencephalon (prethalamus, thalamus, hypothalamus, subthalamus, epithalamus, and pretectum) and the telencephalon (cerebrum). The cerebrum consists of the cerebral cortex, underlying white matter, and the basal ganglia.
When the embryonic prosencephalon fails to divide the brain into two lobes, it results in a condition known as holoprosencephaly.

Additional images

’ incubation, viewed from the ventral surface. X 26
forebrain in German: Prosencephalon
forebrain in French: Prosencéphale
forebrain in Korean: 전뇌
forebrain in Dutch: Prosencephalon
forebrain in Norwegian: Prosencephalon
forebrain in Russian: Передний мозг
forebrain in Simple English: Prosencephalon
forebrain in Thai: สมองส่วนหน้า
forebrain in Ukrainian: Передній мозок
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