Schematic drawings showing the location of the medaka olfactory nerve in right lateral view (A) and ventral view (B). The olfactory nerve is shown in red. For the purposes of comparison, the rostral part of the carp brain in dorsal view is also shown (C). The olfactory bulb of the carp does not come into contact with the telencephalon. BO, olfactory bulb; CC, corpus cerebelli; CN, nasal cavity; H, hypophysis ; LE, left eye; LI, inferior lobe; nⅠ, olfactory nerve; RE, right eye; TE, telencephalon; TO, optic tectum.