Fig. 2. Immunocytochemical localization of neural elements (green) and F-actin labelling of muscle (red) in the velum. (A) Lateral view of a velar lobe showing 5-HT-immunoreactive axons (green) with varicosities along the muscles and concentrated distally near the pre-oral cells. Scale bar, 30 µm. (B) Lateral view of a velar lobe showing FMRFamide-immunoreactive axons (green) and muscle fibres (red). Scale bar, 30 µm. (C) High magnification of the edge of a velar lobe showing FMRFamide immunoreactive axons (green) and muscle fibbers (red). Scale bar, 25 µm. (D) Lateral view of a velar lobe showing Leu-enkephalin-immunoreactive axons (green) and muscle fibres (red). Scale bar, 30 µm. (E) Lateral view of a velar lobe showing TH-like immunoreactive cells and axons. Scale bar, 10 µm. (F) High magnification of the edge of a velar lobe showing TH-like immunoreactive cells and axons and cells containing pre-oral and post-oral cilia. Scale bar, 10 µm.