Amnesia

~ is defined as a profound memory loss that is usually caused by an injury to the brain .
~ 2 main types of amnesia :

1.Anterograde amnesia
~ cannot remember recent information ( crash ) short term memory goes away , is usually caused by damage to the hippocampus fornix , and mamillary bodies ~ the areas of the brain that form new memories . But you will remember event so long ago .

2.Retrograde amnesia
~ it is the opposite of anterograde amnesia . can remember the crash ( or any trauma ) clearly , but not the events before it . usually lose all memory of the events just before the crash . but the long term memory ( name and where you work ) is likely to be safe . is usually caused by damage to the areas of your brain used in storing old memories , ( temporal lobes and hippocampus )

~ in rare cases , both anterograde and retrograde amnesia can exist in the same patient .
~ it is very difficult to recover lost memories for retrograde amnesia .