Hypothalamus ( His, 1893b ) : By this definition the preoptic region (Swanson, 1976b, pp. 229-235) of the hypothalamus (Kuhlenbeck, 1927) and pars optica hypothalami (His, 1893b) are within the telencephalon (His, 1893b); also see His (1895, Figs. 17-20).

Pars optica hypothalami ( His, 1893b ) : Basically it consists of the anterior and tuberal regions (Swanson, 1987, p. 2) of the hypothalamus (Kuhlenbeck, 1927). It is part of the telencephalon (His, 1893b); see His (1893b, p. 178; 1895, p. 158).

Rhombencephalon ( His, 1893b ) : Latin synonym for rhombicbrain (His, 1893b); p. 173.

Rhombicbrain ( RB ; His, 1893b ) : The caudal (Cleland, 1879) of the three primary brain vesicles-the primary hindbrain vesicle (Baer, 1837)-of the vertebrate neural tube (Baer, 1837) develops into the adult topographic division, the rhombicbrain. The latter contains the hindbrain (Baer, 1837) or synonymous secondary hindbrain (Sharpey et al., 1867)-which is the cerebellum (Aristotle) and pons (Haller, 1747)-combined with the medulla (Winslow, 1733) or afterbrain (Baer, 1837). His introduced rhombicbrain for macrodissected adult vertebrates (in the original German, "Rautenhirn", p. 173), and Herrick (1915, p. 121), for example, applied the English form used here. Synonyms include rhombencephalon (His, 1893b), epencephalon (Owen, 1868), hindbrain (Carpenter, 1976).

Telencephalon ( His, 1893b ) : Based on comparative embryology including human, it included the endbrain (Kuhlenbeck, 1927) and the preoptic, anterior, and tuberal regions (see Swanson 1987, p. 2) of the hypothalamus (Kuhlenbeck, 1927); pp. 173, 178, 179; also see His (1895, p. 158).