Fig. 2From: Microscopic research on the olfactory organ of the Far Eastern brook lamprey Lethenteron reissneri (Pisces, Petromyzontidae)The photograph (a) of inner structure and schematic diagrams of lateral (b) and upper views of the olfactory organ in Lethenteron reissneri. The blue arrows indicate water flowing. GS, external gill slit; L, lamellae; N, nostril; NPP, nasopharyngeal pouch; NV, nasal valve; OC, olfactory chamberBack to article page