Q. A 60-year-old woman presents with dysmetria and intention tremor of the right arm, which are signs of incoordination presumably from a cerebellar lesion. She also exhibits right-sided facial weakness with inability to smile or raise her eyebrows but her power on the right side of the body (arm and leg) remains intact. A lesion is localized to the right lateral, posterior pons. Which of the following tracts or nuclei is most likely involved?