Wernicke’s aphasia also called receptive aphasia, it is caused by damage to the superior temporal gyrus which supplied by inferior division of the MCA. With Wernicke’s aphasia, speech is fluent but the patient has impaired comprehension. This usually manifests as an inability to follow verbal directions. usually the patient retains the ability to follow visual cues.
Broca’s aphasia is caused by damage to the posterior inferior frontal lobe.
Conductive aphasia is caused by damage to the arcuate fasciculus.