A smaller number of segment types are made with what is called displaced articulation, where the active articulator is displaced from its anatomically neutral position. (...). Further examples of displaced articulations concern some articulations of the tip and blade of the tongue. In the neutral disposition, the tip lies opposite the upper front teeth, and the blade lies below the alveolar ridge. Displacement would therefore be involved when the tip of the tongue (technically called the apex of the tongue) is used as the active articulator in segments where the passive articulator is not the upper front teeth, or where the blade of the tongue (technically the lamina of the tongue) is used in segments for which the passive articulator is not the alveolar ridge. (...). Equally, when the tip or blade of the tongue is brought forward to protrude between the upper and lower teeth, in an interdental place of articulation, this too counts as displaced.