Final answer:
The posterior cervical line pertains to the alignment of cervical vertebrae's spinous processes; a discontinuity may suggest spinal issues. It is not a standard term but relates to the cervical curve's concavity in the neck region.
Step-by-step explanation:
The posterior cervical line generally refers to the alignment of the spinous processes in the cervical region of the spine viewed from a lateral (side) x-ray. The landmarks for this line would be the palpable bony prominences along the neck, which correspond to the spinous processes of the cervical vertebrae. If this line appears discontinuous on an x-ray, it may indicate a problem such as misalignment, fracture, or other abnormalities within the cervical spine.
It is worth noting that the term posterior cervical line is not a commonly used one in medical textbooks or practice. However, this concept is relevant concerning the cervical curve, which refers to the posteriorly concave curvature of the cervical vertebral column. This curvature is a secondary curve of the vertebral column, and any disruptions in it can be clinically significant.