Mushroom Body Pedunculus and Lobes

Fig. 1 Horizontal section (anterior is down, posterior is up) showing the branched axons of Kenyon cells in the beta- and gamma-lobe. Note the posterior disposition of the beta-lobe with respect to its larger (gamma-lobe) companion. The fan-shaped body is here shown with a diffuse arrangement of varicose processes. Note the large axon (indicated by an asterisk) traversing the fan-shaped body and arborizing in the contralateral (left) superior medial protocerebrum (s m pr).

Fig. 2 Horizontal section showing unbranched parallel axons of Kenyon cells in the mushroom body's pedunculus (mb ped) and the inner most group of dendrites belonging to the basal ring (ba ri) of its calyx. A large arborization in the medial protocerebrum derives from cell bodies lying amongst those belonging to Kenyon cells.

NJ Strausfeld and LC Hansen, ARLDN, Tucson

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