 The earliest description of the ridge running along the floor of the temporal horn of the lateral ventricle comes from the Venetian anatomist Julius Caesar Aranzi (1587), who likened it first to a silkworm and then to a seahorse (Latin "hippocampus", from Greek ἱππόκαμπος, from Greek ἵππος, "horse" + κάμπος, "sea-monster").The German anatomist Duvernoy (1729), the first to illustrate the structure, also wavered between "seahorse" and "silkworm".