The image to the left shows the brain with the left temporal lobe colored in light blue.
The anatomy you need to know is simply that the left temporal lobe has to do with understanding language. Now you know that if a person suffers an injury involving the left temporal lobe of his brain, the person may have difficulty understanding what people are saying. People will think the person is confused. In reality, he doesn't understand the language.
Understanding the basic anatomy lets you better understand the injury.