Forebrain and Midbrain of Lizards 
19 
Figure 4. Plot of regional distribution and relative intensity of succinate dehydrogenase in the left telence- 
phalic hemisphere of Iguana iguana. Intensity plotted as relative optical absorbance. A-D, sensory zones of 
anterior division of dorsal ventricular ridge; cd, dorsal cortex; cl, lateral cortex; cm, medial cortex; dvr,p, 
posterior division of the dorsal ventricular ridge; e, entopeduncular nucleus; Ifb, lateral forebrain bundle; 
na, nucleus accumbens; nlot, nucleus of the lateral olfactory tract; ns, nucleus sphericus; ot, olfactory tu- 
bercle; s, septal nuclei; st, striatum. 
Lateral cortex. The lateral cortex in 
lizards is the major target of the main 
olfactory bulb (Goldby, 1937; Gamble, 
1952; Heimer, 1969). All lizards possess a 
pair of laterally situated main olfactory 
bulbs that receive axons of the olfactory 
nerves originating from the olfactory epi- 
thelium, and medially situated accessory 
olfactory bulbs that receive axons of the 
vomeronasal nerves originating from the 
vomeronasal organ. The main olfactory bulb 
projects to the ipsilateral anterior olfactory 
nucleus, olfactory tubercle, the lateral cor- 
tex, and, possibly, the rostral part of the 
