What is the C2 pedicle, pars interarticularis, and isthmus? Anatomical study and review of the literature regarding these confusing terms with proposal of new nomenclature. - Schmidt C; Chaiyamoon A; Cardona JJ; Mathkour M; Scullen T; Iwanaga J; Kalyvas J; Carrera A; Reina F; Dumont AS; Tubbs RS (Acta neurochirurgica, 2023)