What anatomical structure is visible when performing a lateral skull projection?

In a lateral skull projection, the foramen magnum is indeed a visible anatomical structure. This large opening at the base of the skull allows the brainstem to connect with the spinal cord. During a lateral view, the positioning of the skull enables clear visualization of the foramen magnum, providing essential information about cranial anatomy and any potential abnormalities affecting this region.

The pterygoid processes, although important structures located in the sphenoid bone, are not as clearly defined in a lateral view as they would be in other projections. The frontal sinuses and paranasal sinuses are primarily visible in frontal (occipitofrontal) projections where their positions above the nasal cavity can be more readily assessed. As such, these structures do not contribute to the identifying features in a lateral skull projection. The foramen magnum, on the other hand, plays a significant role in cranial and spinal anatomy and is crucial for understanding the overall structure of the skull from this angle.