Figure 3.

Ground pattern organization: correspondence of pathways and orthogonal organization of neurons. (a,b) Congruent circuitry of the rodent hippocampus and insect mushroom body is demonstrated by pathways from olfactory bulb/antennal lobes (OB, AL) targeting, respectively, the dentate gyrus (DG) and calyces (CX), via the entorhinal cortex (EC) and lateral horn (LH). Mossy fibres, whose dendrites are located in the DG, send their parallel processes into CA fields of the hippocampus (HC). Globuli cells, whose dendrites are located in the CX, send their parallel processes in to the mushroom body lobes (MBL). (c,d.) Golgi impregnated rat CA3 (c) or turtle medial cortex (d) resolve orthogonal neuronal arrangement of parallel mossy fibre processes intersected by efferent dendrites of pyramidal cells. (e,f) Golgi-impregnated cockroach mushroom body lobes (e) or layers of Coenobita hemiellipsoid body (f) resolve corresponding orthogonal arrangements of parallel fibres.