“The mechanosensory lateral line detects water movement via clusters of hair cells positioned over the surface of the head and body in specialised structures called neuromasts (Coombs et al., 1989). The hair cells of the lateral line are virtually identical to those found in the inner ear, and they sense movement by deflection of stereocilia. Two lateral line nerves are found posterior to the otic vesicle: the middle lateral line nerve innervates the middle line, whereas the posterior nerve innervates the occipital dorsal and posterior trunk lines. “(Raible & Kruse, 2000).
“The posterior lateral line (PLL) of the trunk and tail arises from placodal cells that undergo partial epithelial-mesenchymal transition and acquire migratory properties. A group of about 100 of these cells, the PLL primordium (PLLP), undergoes caudally directed collective cell migration along the myoseptum, regularly depositing groups of ~20 cells that will differentiate as the accessory and hair cells of the mature neuromast (Metcalfe et al., 1985; Ghysen and Dambly- Chaudière, 2004). Prior to deposition, cells in the trailing zone of the primordium become organised into rosette-like epithelial structures that mature into pro-neuromasts, which are reiteratively formed and deposited every 3-4 hours. When the primordium reaches the end of the tail, it fragments into two or three terminal neuromasts. “(Valdivia et al., 2011)
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