Central Lateral Line Mechanosensory Pathways in Bony Fish

The lateral line mechanosensory system originated early in vertebrate history. It was apparently present in at least some extinct agnathous forms and inherited from these vertebrates by the early gnathostome fishes. So far as is known, the system is present in petromyzontid agnathans, in all extant cartilaginous and bony fishes, and in most larval and many postmetamorphic amphibians (Boord and Montgomery Chapter 16; Fritzsch Chapter 5; Northcutt Chapter 3). By all indications, the lateral line mechanosensory system evolved in early agnathans and was retained in subsequent radiations; it is thus by definition homologous among those vertebrates that possess it. This homology is reflected both in the anatomical similarity of the neuromasts across groups and in the similarity in the overall pattern of central connections of the system, at least among gnathostomes. This chapter will summarize our current understanding of these central anatomical pathways in bony fish, pointing out variations within this group and similarities to cartilaginous fishes and amphibians.

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