An instrument with - a tool head which is articulated on a distal end of an elongate shank, - a jaw part pair (7a, 7b) for shear cutting, pinching or gripping, wherein the jaw part pair (7a,b) comprises a first jaw part and a second jaw part, and - a first tool control cable for the first jaw part and a second tool control cable for the second jaw part; wherein the tool head can be bent in a defined manner with respect to a longitudinal axis of the shank about a polar angle (θ) in a bending plane (y-z) which is parallel to the longitudinal axis, by way of at least two convexly curved rolling surfaces (13, 15) which bear on one another, wherein the first jaw part and the second jaw part are pivotable with respect to the tool head independently of one another in a tool plane (x-z) which is essentially perpendicular to the bending plane (y-z), and wherein the first jaw part and the second jaw part each define a cylinder-jacket-shaped or cone-jacket-shaped tool control cable surface (29a,b), on which at least one tool control cable section (27a,b) in the form of spiral section can be partly wound on and wound off, wherein a first rolling surface of the at least two rolling surfaces (13, 15) is divided by way of a web which runs in the bending plane (y-z) into a first section and a second section, and a second rolling surface of the at least two rolling surfaces (13, 15) is divided by way of a groove which runs in the bending plane (y-z) into a first section and a second section, wherein the web at each bending position of the tool head engages at least partly into the groove wherein the web at the apex side defines two bending control cable guides, wherein the bending control cable guides run symmetrically with respect to the longitudinal axis, wherein each of the tool control cables (11a,b) comprises a first tool control cable section (23a,b) a second tool control cable section (25a,b) and a third tool control cable section (27a,b), wherein the first tool control cable section (23a,b) leads essentially in the tool plane (x-z) and essentially in a straight line on a first lateral side in the longitudinal direction of the shank from the shank to the respective jaw part (7a,b), wherein the second tool control cable section (25a,b) leads essentially in the tool plane (x-z) essentially in a straight line on a second lateral side which is diametrically opposite the first lateral side, in the longitudinal direction of the shank from the shank to the respective jaw part (7a,7b), and the third tool control cable section (27a,b) connects to the first and the second tool control cable section (25a,b, 27a,b) and is non-positively connected to the respective jaw part (7a,7b), wherein the third tool control cable section of the first jaw part is spread out with respect to the third tool control cable section of the second jaw part, from the shank towards the jaw parts (7a, b) in the bending plane (y-z), wherein the third tool control cable section (27a, b) which runs on the tool control cable surface (29a,b) is led in a lateral outer region of the tool control cable surface (29a,b) into the respective jaw part (7a,b). - a tool head which is articulated on a distal end of an elongate shank, - a jaw part pair (7a, 7b) for shear cutting, pinching or gripping, wherein the jaw part pair (7a,b) comprises a first jaw part and a second jaw part, and - a first tool control cable for the first jaw part and a second tool control cable for the second jaw part;