A 52-year-old woman from Mumbai is admitted with sudden onset of right facial weakness, dysarthria, and mild right arm weakness. MRI brain shows a small acute infarct in the left basal ganglia region. On detailed examination, her right eye cannot close completely, and she has difficulty pronouncing labial consonants. Her right arm power is 4/5, but right leg power is normal (5/5). Which part of the internal capsule is most likely affected?