Hypencephalon ( Kupffer, 1893 ) : Synonym for hypothalamus (Kuhlenbeck, 1927) for anamniote embryos; in German, "unterhirn", pp. 51, 94 and Figs. E,F-17-19; also see His (1893b, Fig. 1-H) for human embryo.

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Hypothalamus ( HY ; Kuhlenbeck, 1927 ) : The ventral (Schulze, 1893) topographic division of the interbrain (Baer, 1837): the dorsal (Barclay, 1803) topographic division is the thalamus (His, 1893a). The first adequate description of the hypothalamus as a layer of gray matter surrounding the lower half of the third ventricle (Galen, c173) was provided by Wharton (1656, see 1966 translation, p. 170); His (1893a, pp. 159-162) introduced the term but assigned the preoptic region (Swanson, 1976b, pp. 229-235) of the hypothalamus (Kuhlenbeck, 1927) to the telencephalon (His, 1893b). The definition here was introduced for vertebrates by Kuhlenbeck (1927, p. 67, Ch. 9); also see Christ (1969, p. 23), Nauta & Haymaker (1969, Tab. 4-1).