Central projections of trigeminal, lateral line and inner ear afferents develop at different time. The earliest projection is trigeminal (A) followed by inner ear (B) and mechanosensory lateral line (LL,C). the ampullary electroreceptor projections (ELL) develop after the mechanosensory lateral line (D) and are completely adult only several stages later (E). Note the gap of labeled afferent fibers (in C,D,E) between the lateral line projections and the descending tract of the trigeminal projection (dV) that contains the unlabeled VIIIth nerve projection (VIII). Note also that the mechanosensory lateral line has two mostly discrete bundle per labeled trigeminal nerve (V1, supraorbital nerve; V2 infraorbital nerve) whereas the ampullary organ afferents are intermixed. Bars indicate 100μm, Modified after [Fritzsch et al. 2005].