FIGURE 1. Digital endocast for FMNH PR2081, Tyrannosaurus rex. A, stereopair of endocast in ventrolateral view; B, stereopair of endocast in dorsolateral view; C, D, line interpretations of endocast in ventrolateral (C) and dorsolateral (D) view. Cranial nerves indicated with Roman numerals; note separation between ophthalmic (V1) and maxillo­mandibular (V2,3) branches of the trigeminal nerve. The left facial (VII) and vestibular statoacoustic (VIII.v) are shown. Abbreviations: cblm, cerebellar region (cerebellum itself not visible); cbm, cerebrum; f, forebrain; fm, foramen magnum; fpr, cast of perilymphatic foramen; fr, mold of floccular recess; h, hindbrain; m, midbrain; mf, cast of metotic fissure; olb, olfactory bulb; orb, right orbit; pf, pituitary fossa; ssc, semicircular canals; us, utricular sinus; vcd, dorsal cerebral vein; vcm, middle cerebral vein; vs, vascular structure;? unknown structure ventral to right trigeminal ganglion.