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Background : Traditionally , the term kernicterus ( literally yellow kern , with kern indicating the most commonly afflicted region of the brain , ie , the nuclear region ) refers to an anatomic diagnosis made at autopsy based on a characteristic pattern of staining found in babies who had marked hyperbilirubinemia before they died . The morphology and velocity gradient we see do not argue alone that the streamer is falling in towards the nuclear region ; it is only when combined with the heating seen and the increase in line width at the northern tip of the streamer that the argument becomes strong . It is expected that if the gas is moving from the 20 km sec $ ^ { -1 } $ cloud to the nuclear region , it would interact with the CND and become disrupted , resulting in an increase in the line width of the gas , regardless of whether the motion is predominantly along or across the line of sight . The visual appearance resembles the photo : The spiral arms show up as a grainy background , which brightens slowly from outward and then rapidly to the nuclear region , which is still grainy . The encounter has also left traces in the spiral pattern of the brighter and larger galaxy M81 , first making it overall more pronounced , and second in the form of the dark linear feature in the lower left of the nuclear region . Are we really just seeing the disks of S0 galaxies extended into the nuclear regions ?