Organization of ADVR 
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Figure 9. Sections through the brain of a water snake which underwent a unilateral transection of the mid- 
brain. The brain was subsequently prepared by a Fink-Heimer procedure. Degenerated axons run rostrally 
through the forebrain bundles (FB) and extend into both caudal and rostral ADVR. A comparable but 
less dense projection to the contralateral side of the brain is not shown. Abbreviations: AC, anterior com- 
missure; ADVR, anterior dorsal ventricular ridge; AOT, accessory olfactory tract; FB, forebrain bundles; 
LFB, lateral forebrain bundle; LGN, dorsal lateral geniculate nucleus; NS, nucleus sphericus; OC, optic 
chiasm; ON, optic nerve; OT, optic tract; S, septum. 
