What is the name of CN XI?

The correct name for CN XI is the Spinal Accessory Nerve. This cranial nerve has two components: a cranial part that arises from the medulla oblongata and a spinal part that originates from the upper cervical spinal cord. It is responsible for innervating certain muscles, specifically the sternocleidomastoid and trapezius muscles, which are involved in head movement and shoulder elevation.

The term "Accessory Nerve" is sometimes used informally to refer to this cranial nerve, but the more accurate designation that reflects its anatomy and function is the Spinal Accessory Nerve. Understanding the precise terminology is important in the context of anatomical studies, clinical practice, and communicating effectively in healthcare. In contrast, the Hypoglossal Nerve pertains to tongue movements, and the Oculomotor Nerve is primarily involved in eye movement and pupil constriction. Therefore, the Spinal Accessory Nerve is distinct and specifically related to neck and shoulder muscle control.