A syringe comprising: a syringe body having an axial inner cavity, which extends in the direction of a longitudinal axis of the syringe body and in which a plunger can be or is accommodated in such a way that the plunger can be moved in the longitudinal direction, and a needle, which can be or is connected to the syringe body at a longitudinal end of the syringe body, wherein the syringe body has a coupling segment at its needle-side longitudinal end, to which the needle can be or is fastened by means of a connecting element that can be slid on along the longitudinal direction, at least one radially inwardly formed cavity is provided on the coupling segment, which can be brought into engagement or is in engagement with at least one corresponding locking segment provided on the connecting element, wherein the connecting element is formed as a hull, which comprises a syringe body-side connecting segment and a needle-side supporting segment, wherein the at least one locking segment is arranged on the connecting segment, wherein on the connecting segment several locking segments are provided distributed in a circumferential direction, the locking segments extending along the inner circumference of the hull and point radially inwards, and that the connecting segment comprises in the region of the locking segments grooves that extend in the longitudinal direction and that begin at a syringe body-side end of the hull and point into the direction of the needle-side end of the hull such that the locking segments comprise several locking segment parts (70, 72, 74), which are arranged on corresponding connecting segment parts, wherein the connecting segment parts can be deflected in a radial direction, wherein non-deflectable connecting segment parts of the connecting segment lie in circumferential direction respectively between the distributed arranged locking segments, characterized in that the syringe further comprises tensioning means, by means of which an axial pretension can be or is produced between the coupling segment and the connecting element, the pretension acting on sealing elements (42, 44), which are accommodated between the coupling segment and the connecting segment, wherein the tensioning means comprises the at least one cavity on the coupling segment, wherein the cavity extends along the circumference of the coupling segment and is formed as a thread. a syringe body having an axial inner cavity, which extends in the direction of a longitudinal axis of the syringe body and in which a plunger can be or is accommodated in such a way that the plunger can be moved in the longitudinal direction, and a needle, which can be or is connected to the syringe body at a longitudinal end of the syringe body, wherein the syringe body has a coupling segment at its needle-side longitudinal end, to which the needle can be or is fastened by means of a connecting element that can be slid on along the longitudinal direction, at least one radially inwardly formed cavity is provided on the coupling segment, which can be brought into engagement or is in engagement with at least one corresponding locking segment provided on the connecting element, wherein the connecting element is formed as a hull, which comprises a syringe body-side connecting segment and a needle-side supporting segment, wherein the at least one locking segment is arranged on the connecting segment, wherein on the connecting segment several locking segments are provided distributed in a circumferential direction, the locking segments extending along the inner circumference of the hull and point radially inwards, and that the connecting segment comprises in the region of the locking segments grooves that extend in the longitudinal direction and that begin at a syringe body-side end of the hull and point into the direction of the needle-side end of the hull such that the locking segments comprise several locking segment parts (70, 72, 74), which are arranged on corresponding connecting segment parts, wherein the connecting segment parts can be deflected in a radial direction, wherein non-deflectable connecting segment parts of the connecting segment lie in circumferential direction respectively between the distributed arranged locking segments, characterized in that the syringe further comprises tensioning means, by means of which an axial pretension can be or is produced between the coupling segment and the connecting element, the pretension acting on sealing elements (42, 44), which are accommodated between the coupling segment and the connecting segment, wherein the tensioning means comprises the at least one cavity on the coupling segment, wherein the cavity extends along the circumference of the coupling segment and is formed as a thread.