Final answer:
The lateral skull X-ray positioning does not use specified principles such as Principle A, B, C, or D; instead, it involves placing the patient's head side against the imaging surface. The axial skeleton includes the skull, which has cranial and facial bones, and the cranial fossae are regions within the cranial cavity with specific boundaries and containing different brain parts.
Step-by-step explanation:
The true lateral position of the skull for radiographic imaging indeed applies specific principles to ensure clear and accurate representation of the skull's structures. In the context of X-ray imaging, neither of the principles A, B, C, nor D are standard radiographic terms used to describe the correct positioning for a lateral skull X-ray. Instead, this involves positioning the patient so that the side of the head is placed against the imaging surface, with the X-ray beam directed perpendicular to the imaging plane to capture a true side view of the skull.
Discussing the anatomy relevant to this procedure, the axial skeleton consists of bones that form the body's vertical axis, which includes the skull, spine, and rib cage, totaling 80 bones. The skull can be divided into two main parts: the cranial bones (also known as the brain case), which protect the brain, and the facial bones, which structure the face. There are 8 cranial bones and 14 facial bones. Among those cranial bones, you can find major sutures that connect with various bones.
The anterior, middle, and posterior cranial fossae are regions on the floor of the cranial cavity, each bounded by specific structures and housing different parts of the brain. For example, the anterior cranial fossa is bounded anteriorly by the frontal bone and posteriorly by the lesser wing of the sphenoid bone, and it is where the frontal lobes of the brain rest. The middle cranial fossa is bounded laterally by parts of the sphenoid bone and the temporal bone and holds the temporal lobes. The posterior cranial fossa, which is the deepest, is bounded anteriorly by the petrous ridge of the temporal bone and houses the cerebellum.