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Fig. 1. Anatomy and innervation of ciliated cells on the velum. (A) Lateral view of
a velar lobe showing tubulin-like immunoreactivity in cell bodies and cilia
along the pre- and post-oral bands. Scale bar, 20 µm. (B) Lateral view of
the velum at a slightly deeper focal plane showing details of the pre-oral
ciliated cells and a bundle of tubulin-like immunoreactive axons (arrows) at
their bases. Scale bar, 20 µm. (C) At higher magnifications,
serotonin-immunoreactive fibres and varicosities (arrows) can be seen near the
bases of the pre-oral ciliated cells. Scale bar, 10 µm. (D) Lines of
varicosities (arrows) exhibit Leu-enkephalin immunoreactivity. Pre-oral cells
possess slender nuclei at their bases. Scale bar, 10 µm.