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telencephalon The anterior region of the brain, part of the prosencephalon, which includes both the olfactory lobes and cerebrum. In plesiomorphic tetrapods, the telencephalon constitutes a small portion of the total brain mass, while in more developed tetrapods the telencephalon becomes increasingly large with the development of the neopallium within the highly corticized cerebral hemispheres.

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telencephalon (tel-en-sef-ă-lon) n. see cerebrum.