Central ( Barclay, 1803 ) : Toward the center of the body. Barclay (1803, pp. 120-121, 164) introduced a formal distinction between central and peripheral (Barclay, 1803), although use of the term as toward the center of the body goes back at least to Aristotle in De Partibus Animalium; see translation of Ogle (1912, 672-34).

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