Final answer:
In the lateral position, the sacrum lies posterior to the mid coronal plane. The sacrum is formed by the fusion of five sacral vertebrae and has transverse ridges on the anterior surface and a median sacral crest on the posterior surface.
Step-by-step explanation:
The sacrum lies posterior to the mid coronal plane in the lateral position. The sacrum is a triangular-shaped bone formed by the fusion of five sacral vertebrae. On the anterior surface of the sacrum, the lines of vertebral fusion can be seen as transverse ridges. On the posterior surface, running down the midline, is the median sacral crest.
Although it is difficult to provide an exact measurement without more specific information, the sacrum is generally located posterior to the mid coronal plane. It is important to note that the exact position of the sacrum can vary between individuals.