Sections through oral veil papillae and tentacle stained with anti-tubulin AB (green) and phalloidin (red), showing nerve and muscle structures, respectively.

A: Horizontal section of a papilla at relatively low power. Arrowheads indicate papillar lobules with cilia clusters. B, C: Extensively branching nerves (arrows) approach clusters of cilia (arrowheads, which are also labeled by anti-tubulin AB. D: Higher magnification shows that each cilia cluster (arrowheads) is innervated by a small nerve branch (arrows). Scale bars: A, 500 μm; B, C: 100 μm; D, 50 μm.