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