Terminal Buds in the Branchial Tube of the Brook Lamprey (Lampetra planeri (Bloch))—Putative Respiratory Monitors

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Abstract
Scanning and transmission electron microscopy showed that the sensory buds are structurally similar to those on the gill arches of the larva. They are composed of ciliated receptors, microvillous supporting cells, peripheral cells and, occasionally, Merkel cells. The connection between receptors and nerves is unusual among vertebrate sensory organs, appearing like a reversed neuromuscular junction. From their structure and localization it is suggested that the terminal buds are chemoreceptive organs involved in evaluation of the respiratory water.