Trey then peered in at the pupils. “Round, eight millimeters,” he shouted. “Did you measure or are you guessing?” Up went Trey’s eyebrows and out came a round laminated pupil gauge with a series of black circles of increasing size. Trey held it up to the patient’s eye. “Okay, seven millimeters and not reactive.” The midbrain could now be checked off the list, given that it controls pupillary size and reaction to light.
