Cervical posture is normal? Orthoposition and lateral position? Or lateral position and double oblique position?

Orthographic film: focusing on antegrade, uncinate joint, pedicle, etc.

Lateral film: focus on physiological curvature (including spondylolisthesis), vertebral shape, bone changes, intervertebral space changes, anterior longitudinal ligament, nuchal ligament, superior spinous ligament and so on.

Oblique film: focus on intervertebral foramen and facet joints.

Open mouth position: the focus is on the vertebral body and intervertebral space of atlas and axis.