A device for sectioning a vertebral lamina, which can comprise a base for positioning the device and protecting the medullar canal when sectioning the lamina, sectioning means slide-mounted in the base along a first axis, a first piston slide-mounted in a sleeve of the sectioning means along a second axis secant to the first sliding axis of the sectioning means, a second piston made integral with the first piston and slide-mounted in the base along a third axis, the sectioning means being provided with a cutting element oriented in opposite direction to the second piston with respect to the sleeve, and the sliding of the second piston along the third axis causing the sliding of the sectioning means along the first axis via the first piston.
