A mixing cartridge for a sanitary fitting, having: a) a cartridge housing with a first housing part and a second housing part, b) a mixing chamber formed in the cartridge housing, c) at least one hot water inlet for hot water, extending through the cartridge housing and opening into the mixing chamber, d) at least one cold water inlet for cold water, extending through the cartridge housing and opening into the mixing chamber, e) at least one mixed water outlet for mixed water, leading out of the mixing chamber, f) a control body which can be displaced along a control path, the control body having a first annular portion which at least partially delimits the at least one cold water inlet in the cartridge housing in order to form a radially inwardly directed flow path for the cold water, a second annular portion which at least partially delimits the at least one hot water inlet in the cartridge housing in order to form a radially inwardly directed flow path for the hot water, and a first and a second tubular shoulder (15, 16) which divert the radially inwardly directed flow path of the cold water and the radially inwardly directed flow path of the hot water, respectively, in a longitudinal direction of the cartridge housing, the first tubular shoulder projecting beyond the first annular portion in the direction of a first longitudinal end of the control body, and the second tubular shoulder projecting beyond the second annular portion in the direction of a second longitudinal end of the control body, characterized in that the mixing cartridge has no expansion element for actuating the control body, and in that an axial thickness of the radially inwardly directed flow path for the cold water and the radially inwardly directed flow path for the hot water is adjustable by the displacement of the control body, so that a flow rate of the hot water through the radially inwardly directed flow path for the hot water and a flow rate of the cold water through the radially inwardly directed flow path for the cold water are adjustable. a) a cartridge housing with a first housing part and a second housing part, b) a mixing chamber formed in the cartridge housing, c) at least one hot water inlet for hot water, extending through the cartridge housing and opening into the mixing chamber, d) at least one cold water inlet for cold water, extending through the cartridge housing and opening into the mixing chamber, e) at least one mixed water outlet for mixed water, leading out of the mixing chamber, f) a control body which can be displaced along a control path, the control body having a first annular portion which at least partially delimits the at least one cold water inlet in the cartridge housing in order to form a radially inwardly directed flow path for the cold water, a second annular portion which at least partially delimits the at least one hot water inlet in the cartridge housing in order to form a radially inwardly directed flow path for the hot water, and a first and a second tubular shoulder (15, 16) which divert the radially inwardly directed flow path of the cold water and the radially inwardly directed flow path of the hot water, respectively, in a longitudinal direction of the cartridge housing, the first tubular shoulder projecting beyond the first annular portion in the direction of a first longitudinal end of the control body, and the second tubular shoulder projecting beyond the second annular portion in the direction of a second longitudinal end of the control body, characterized in that the mixing cartridge has no expansion element for actuating the control body, and in that an axial thickness of the radially inwardly directed flow path for the cold water and the radially inwardly directed flow path for the hot water is adjustable by the displacement of the control body, so that a flow rate of the hot water through the radially inwardly directed flow path for the hot water and a flow rate of the cold water through the radially inwardly directed flow path for the cold water are adjustable.