Figure 1.

Comparison of arthropod and annelid mushroom bodies. (a) Horseradish peroxidase immunoreactivity and cell nuclei labeling in sagittal sections of the brain of the cockroach Leucophaea maderae reveal the basic neuropil organization. The mushroom body is capped by a dorsal aggregation of small-diameter Kenyon cells (kc) and comprises a calyx region (ca), a peduncle (pd), and an arrangement of median and vertical lobes (lo). (b) Synapsin immunoreactivity in cell nuclei labeled horizontal sections of the brain of the polychaete Nereis diversicolor shows a similar organization of the annelid mushroom body neuropil. gc globuli cells. Scale bars: 80 μm.