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Studies on medium-sized cities in Brazil gain prominence in the academic and public policies development in the 1970s. With the new economic context of globalization and territorial reconfigurations, some authors have proposed the use of the term intermediate city or town intermediary, whose scope is built on qualitative criteria, including the idea of a structured space of relations and flows in us. In the Northeast, the urbanization process was slow, fragmented, dispersed geographic and economically, which resulted in a truncated urban network, which consists primarily of its nine regional capitals and about two dozen medium-sized cities, mostly interiorized. It is from this 'urban network northeastern interiorized' we seek to understand the fundamental functions of Pau dos Ferros (RN), Souza and Cajazeiras (PB) in regional development and the role they play in their respective regions of influence that permeate the ray partition RN-PB-CE. A priori these functions would offer enough jobs to accommodate the population surrounding rural and absorb the population of urban are as saturated and ease living conditions. In general terms, what can be seen is that trade and services has a very high relative share in the PIB composition of the three cities, reinforced by the participation of the state, especially the provision of education services, including higher and health, beyond of jobs, particularly in trade and public services, which allows us to treat them as a priori intermediate cities. [ABSTRACT FROM AUTHOR]