Invertebrate brain ( BRi ) : The most rostral (Schulze, 1893), largest, most differentiated central ganglion of a central nerve cord (or ganglia if multiple cords are involved); see Bullock & Horridge (1965, pp. 542-550). Cuvier (1800, lecture 11) explicitly discussed invertebrates and their brains without using the term itself.

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Cerebral ganglion : Synonym for invertebrate brain; see Bullock & Horridge (1965, p. 1609).