Gǎnjuéguǎn nèi de gǎnshòu xìbāo kěyǐ tàncè shuǐliú biànhuà.
Receptor cells inside the sensory canals can detect changes in water flow.
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A general anatomy term. In fish it's the lateral-line canal (侧线管); in some invertebrates and vertebrate embryos it refers to ciliated tube-shaped sensory organs. Not the same as 神经管 (neural tube).