A patient is brought to the ER because of left arm weakness….

Questions

A pаtient is brоught tо the ER becаuse оf left аrm weakness. On exam, the patient demonstrates: -> left lower facial paresis, but he can wrinkle his brow, -> a right gaze preference (i.e., eyes deviate to right), -> speech is relatively normal. Evaluation of strength reveals: -> moderate weakness of the left arm but normal strength in all other extremities. Additionally, the patient shows: -> diminished fine touch, proprioception, pain and temperature sensitivity for the left arm and face. A stroke in which of the following vessels is most likely the cause of the patient's symptoms?