FIGURE 4. A in A digitally-rendered endocast for Tyrannosaurus rex

FIGURE 4. A, line interpretation of endocast of FMNH PR2081 (Tyrannosaurus rex) in dorsal view, showing full estimated extent of olfactory bulbs; B, transverse CT section (2 mm thick) through skull immediately dorsal to orbits, showing expanded olfactory bulbs anterior to endocranial cavity; C, diagram of skull showing location of section in D. Abbreviations: fm, foramen magnum; I, olfactory tract; olb, olfactory bulb; orb, orbit; se, sphenethmoid.