The Units of Scientific Culture and Innovation (UCC+i) have become one of the most dynamic agents in the dissemination of science in Spain. Using our own methodology based on a survey of almost 60 professionals, four key aspects of their professional structure are analysed exhaustively: main functions, institutional location, evolution of the human resources available to them, and the professional recognition given to them. After contextualising the origin, evolution, and current map of the UCC+i, the results indicate that these units specialise mainly in the communication of results and the dissemination of science. And, to a lesser extent, they perform advisory and training functions. At the institutional level, they are placed under the supervision of the communication and research areas. Regarding staffing, the most common structure is that of three professionals, but with little expectation of expansion and limited recognition by the universities themselves. In short, their high professional visibility is identified as their main strong point, and the lack of economic resources as a serious problem for their development.