Here the two structures of base are defined by the permanence and the relative rigidity of the mechanisms constitute that them: way of constitution of I, treatment of the pulses and its representations, paper of the regulating and prohibitive instances, degree of evolution libidinous person, type of objetal relation, balance of the narcsicos investments and object, variety of the bow with the reality, dialectic between pleasure principle and principle of reality. The narcsico type or ' ' state-limite' ' in an intermediate organization that does not present nor solidity nor the rigidity of these two structures. It constitutes, an unstable narcsico arrangement, kept to the cost of multiple reacionais formations, being able to give the one appearance ' ' hipernormalidade' ' hiding in fact a hipersensibilidade to the abandonment, the depression, the loss of security, the fragile confidence in itself exactly and to auto-they esteem unstable. (FREUD, 1931/1974) Freud if did not occupy of borderline, but diverse to other they had made it psychoanalysts, also taking for base some of its theoretical contributions. The freudiana histrica of the end of century XIX gave place to borderline of today, while theoretical and clinical concern. Freud esbarrou in some questions of diverse orders and borderline was not gone deep the question ' ' preferindo' ' to remain with would histeria and the castration, even so has mentioned the importance of the support and the anacltica relation, entorno familiar and other pertinent questions of to borderline. One of the complicated questions Freud to understand borderline is that this if finds immersed in the relation with the other, dependent of it, overwhelming with separations, needing a relation the two, needing to find an analyst present while he himself. Although to need limits, borderline is not demanding castration, but a meeting with an analyst who exists as person, and not only while transferencial quality, conception this next one to the one of Winnicott of what of the one of Freud.