Fig. 8. Cyclic-GMP-like immunoreactivity in the suboesophageal ganglion (SOG). (A–C) Schematic drawings of the SOG in a ventral (A), dorsal (B) and lateral (C) view. For orientation, the cells shown in D–H are indicated by dots in the drawings (D in A, E–H in B). In C, the planes of sectioning are indicated. Anterior is to the top in all panels. (D) Ventral section showing two very prominent cGMP-immunoreactive cells located between the roots of nerve 5. Note that this nerve also contains immunoreactive fibres. (E) Large anterior and lateral cGMP-immunoreactive neurones. (F) Dorsal anterior medial cells. (G) Ventral section showing immunoreactive fibres in the mandibular nerve (N1) and stained neuropilar regions along the midline. (H) Stained structures in the mandibular neuropil (anterior) and a posterior medial neuropilar area. N1–N7, nerves 1–7. Scale bars, 100 µm.