Trimble begins by exploring the brain anatomy  of human emotion,implicating the limbic system as the seat of human emotion.Seated deep within the brain and consisting of a network of critical structures,the limpic system is the oldest part of the mammalian brain.There is considerable data today from brain imagin studies to show that this part is closely associated with imotional disorders.For example the amygdala a multinucleated structure intricately connected with many brain parts ,has been shown to both vary in size and to have dfferent levels of neurochemical activity in various emotional disorders.The amygdala is today the focus of much of the brain reserch that is concerned with human emotion and emotional disorders.Expounding the on the neurobiology of emotion beyond these structures,Trimble discusses their links with other critical brain atreases.He quates extensively from the work of 20th centuary experts who have contributed to our understanding of emotional brain function,exploring brain anatomy beyond limpic structures that has a role in human emotion.