Final answer:
The cranial nerve XI, or spinal accessory nerve, can be visualized in a study of the soft tissue neck.
Step-by-step explanation:
The cranial nerve XI, also known as the spinal accessory nerve, could be visualized in a study involving the soft tissue neck. This cranial nerve is responsible for innervating certain muscles in the neck, such as the sternocleidomastoid and trapezius muscles. It is not typically seen in studies focusing on the lumbosacral spine, supratentorium, or internal auditory canal, as these areas are not associated with the path of the spinal accessory nerve.