A compound of the formula I in which X is selected from the series consisting of CH 2 and CH 2 -CH 2; R 1a is selected from the series consisting of H, F, Cl, Br, (C 1 -C 6)-alkyl and CN; R 1b is selected from the series consisting of H, F, Cl and (C 1 -C 6)-alkyl; R 1c is selected from the series consisting of H, F, Cl and (C 1 -C 6)-alkyl; R 2a is selected from the series consisting of H, F, Cl, Br, (C 1 -C 6)-alkyl, CN, CO 2 R 5 and CONR 5 R 5'; R 2b is selected from the series consisting of H, F, Cl and (C 1 -C 6)-alkyl; R 2c is selected from the series consisting of H, F, Cl and (C 1 -C 6)-alkyl; R 5, R 5' are independently of each other selected from the series consisting of H and (C 1 -C 4)-alkyl; one of the groups Y 1 and Y 2 is N, N-oxide or CR 2d, the other is C-Z-R 3 -R 4; R 2d is selected from the series consisting of H, F, Cl and (C 1 -C 4)-alkyl; Z is selected from the series consisting of a bond, O, CO, COO, S, SO and SO 2; R 3 is selected from the series consisting of a bond and (CR 3 R 6') n; R 6, R 6' are independently of each other selected from the series consisting of H and (C 1 -C 6)-alkyl, which is unsubstituted or monofluorinated; n is selected from the series consisting of 1, 2, 3, 4 and 5; R 4 is selected from the series consisting of (C 1 -C 6)-alkyl, mono-, di- or trifluorinated (C 1 -C 6)-alkyl, (C 2 -C 6)-alkenyl, (C 2 -C 6)-alkynyl, CO 2 R 5, OR 7, NR 8 R 8', SR 9, (C 3 -C 8)-cycloalkyl, a 4- to 6-membered heterocycle, which comprises one or two identical or different ring heteroatoms selected from the series consisting of N and O, phenyl, a 5- to 6-membered heteroaryl, which comprises one, two or three identical or different ring heteroatoms selected from the series consisting of N, O and S, wherein all cyclic groups within R 4 are unsubstituted or substituted by one to three identical or different substituents selected from the series consisting of (C 1 -C 4)-alkyl, (C 1 -C 4)-alkanoyl, hydroxy-(C 0 -C 4)-alkyl, (C 1 -C 3)-alkoxy-(C 0 -C 4)-alkyl, oxo (=O), F and Cl; R 7 is selected from the series consisting of H, (C 1 -C 6)-alkyl, hydroxy-(C 1 -C 4)-alkyl and (C 1 -C 3)-alkoxy-(C 1 -C 4)-alkyl; R 8, R 8' are independently of each other selected from the series consisting of H and (C 1 -C 3)-alkyl and R 9 is (C 1 -C 6)-alkyl; in any of its stereoisomeric forms, or a mixture of stereoisomeric forms in any ratio, or a physiologically acceptable salt thereof, or a physiologically acceptable solvate of any of them. X is selected from the series consisting of CH 2 and CH 2 -CH 2; R 1a is selected from the series consisting of H, F, Cl, Br, (C 1 -C 6)-alkyl and CN; R 1b is selected from the series consisting of H, F, Cl and (C 1 -C 6)-alkyl; R 1c is selected from the series consisting of H, F, Cl and (C 1 -C 6)-alkyl; R 2a is selected from the series consisting of H, F, Cl, Br, (C 1 -C 6)-alkyl, CN, CO 2 R 5 and CONR 5 R 5'; R 2b is selected from the series consisting of H, F, Cl and (C 1 -C 6)-alkyl; R 2c is selected from the series consisting of H, F, Cl and (C 1 -C 6)-alkyl; R 5, R 5' are independently of each other selected from the series consisting of H and (C 1 -C 4)-alkyl; R 2d is selected from the series consisting of H, F, Cl and (C 1 -C 4)-alkyl; Z is selected from the series consisting of a bond, O, CO, COO, S, SO and SO 2; R 3 is selected from the series consisting of a bond and (CR 3 R 6') n; R 6, R 6' are independently of each other selected from the series consisting of H and (C 1 -C 6)-alkyl, which is unsubstituted or monofluorinated; n is selected from the series consisting of 1, 2, 3, 4 and 5; R 4 is selected from the series consisting of (C 1 -C 6)-alkyl, mono-, di- or trifluorinated (C 1 -C 6)-alkyl, (C 2 -C 6)-alkenyl, (C 2 -C 6)-alkynyl, CO 2 R 5, OR 7, NR 8 R 8', SR 9, (C 3 -C 8)-cycloalkyl, a 4- to 6-membered heterocycle, which comprises one or two identical or different ring heteroatoms selected from the series consisting of N and O, phenyl, a 5- to 6-membered heteroaryl, which comprises one, two or three identical or different ring heteroatoms selected from the series consisting of N, O and S, wherein all cyclic groups within R 4 are unsubstituted or substituted by one to three identical or different substituents selected from the series consisting of (C 1 -C 4)-alkyl, (C 1 -C 4)-alkanoyl, hydroxy-(C 0 -C 4)-alkyl, (C 1 -C 3)-alkoxy-(C 0 -C 4)-alkyl, oxo (=O), F and Cl; R 7 is selected from the series consisting of H, (C 1 -C 6)-alkyl, hydroxy-(C 1 -C 4)-alkyl and (C 1 -C 3)-alkoxy-(C 1 -C 4)-alkyl; R 8, R 8' are independently of each other selected from the series consisting of H and (C 1 -C 3)-alkyl and R 9 is (C 1 -C 6)-alkyl;