Fig. 6 in New Insights Into the Brain, Braincase, and Ear Region of Tyrannosaurs (Dinosauria, Theropoda), with Implications for Sensory Organization and Behavior

Fig. 6. Olfactory structures in Tyrannosaurus rex. A, FMNH PR2081; B, AMNH FR 5117; dorsal views of the cranial endocast. Green structures in A are the caudal portions of the olfactory region of the nasal cavity, which correspond to what Brochu (2000, 2003) regarded as olfactory bulbs. The true limits of the olfactory bulb cast are indicated in blue of the cranial endocast. C, sagittal section of a T. rex skull, showing the cranial endocast in place (generated by registering AMNH FR 5117 to a one-third scale restored sculpture of FMNH PR2081). The large arrow shows the course of the respiratory airway (yellow) through the rostral portion of the nasal cavity, choana, and pharynx. The small, wavy arrow shows the low-velocity path of odorant molecules through the large olfactory region of the nasal cavity (reddish). Scale bar for A–B = 5 cm.