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Between brain : Synonym for interbrain (Baer, 1837). Used by for example Obersteiner & Hill (1900, p. 72), Herrick (1915, p. 121), Williams & Warwick (1980, p. 864), and Nauta & Feirtag (1986, p. 39). ‘Tween-brain is also used; see Nauta & Feirtag (1986, p. 38), Nieuwenhuys et al. (2008, p. 9).
Interbrain ( IB ; Baer, 1837 ) : The caudal (Cleland, 1879) and ventral (Schulze, 1893) topographic division of the forebrain (Goette, 1873); the rostral (Schulze, 1893) and dorsal (Barclay, 1803) division is the endbrain (Kuhlenbeck, 1927). The interbrain in turn has two great topographic divisions, dorsally (Barclay, 1803) the thalamus (His, 1893a) and ventrally (Schulze, 1893) the hypothalamus (Kuhlenbeck, 1927). This basic division of the macrodissected adult human brain (Edwin Smith Surgical Papyrus, c1700 BC) has been recognized at least since Varolio (1573, p. 13, his "pars posterior medullae spinalis"), and it received its current name for vertebrates from Baer (1837, p. 107; in the original German, "Zwischenhirn"). This English form of diencephalon (Sharpey et al., 1867) has been used routinely, for example by Sharpey et al. (1867, p. 577), Johnston (1906, p. 25), Strong & Elwyn (1943, p. 12), and Williams & Warwick (1980, p. 953).