- paleothalamus
- The intralaminar nuclei, believed to have been the earliest components of the thalamus to evolve; they lack reciprocal connections with the isocortex.
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pa·leo·thal·a·mus (pa″le-o-thalґə-məs) [paleo- + thalamus] the phylogenetically older part of the thalamus, i.e., the medial portion which lacks reciprocal connections with the neopallium.
Medical dictionary. 2011.