Forebrain and Midbrain of Lizards 
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Figure 14. Camera lucida drawings of the pretectum of Lacerta (A) and Igria/na (B). av, area ventralis; 
dp, dorsal pretectal nucleus; fr, fasciculus retroflexus; gl. pars ventralis of the lateral geniculate nucleus; 
gp, nucleus geniculatus pretectalis; h, hypothalamus; Im, nucleus lentiformis mesencephali ; mp, medial 
pretectal nucleus; o, optic tract; pc, posterior commissure; pe, pars extensa of nucleus lentiformis 
thalami; pp, pars plicata of nucleus lentiformis thalmi; so, subcommissural organ; vp, ventral pretectal 
nucleus. (Figure after Northcutt and Senn, in preparation.) 
