Writing in 1587, Giulio Cesare Aranzi (1530–1589) describes anstructure ‘continuous with the vaulted body or tortoise (fornix)nwhich has an uneven or bent form that resembles the appearancenof a hippocampus, that is a sea-horse’ (De humano foetu liberntertio editus, ac recognitus. Euisdem anatomicarum observatio-nnum liber, Chapter 3, pp. 45). Paul Broca (1824–1880) andnLudwig Edinger (1855–1918) traced direct connections of the ol-nfactory tract into the hippocampus. But in Trabajos delnLaboratorio de Investigaciones Biologicas del la Universidad denMadrid (Tomo 1: 1901–02; 1–227. Translated as Studies on thenCerebral Cortex by Lisbeth M Kraft, London 1955), SantiagonRamo ´ n y Cajal (1852–1934) writes: ‘ ... the acceptance of thenexistence of direct communicating pathways between the primarynand secondary olfactory centres ... and Ammon’s horn, the fasciandendata, septum lucidum, cingulated gyrus [and] suprasellarnstriae ... finds its way into the field of anatomical investigationnwith the greatest of difficulties’. On the olfactory brain, Cajalnand Camillo Golgi (1843–1926) were of one voice in declaringnthat there are no direct connections between the olfactory tractnand the hippocampus.
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