Final answer:
The cerebrum originates from the telencephalon, which is part of the embryonic forebrain called the prosencephalon. The lateral ventricle is the ventricle associated with the cerebrum.
Step-by-step explanation:
The cerebrum is derived from the telencephalon, which is a part of the prosencephalon or forebrain during embryonic development. Later in development, the telencephalon gives rise to the cerebrum, which is the largest part of the brain responsible for higher brain functions, such as thought and action. The ventricle associated with the cerebrum is the lateral ventricle, one of the four main ventricles within the brain.