What cranial nerve is identified as CN XII?

• A. Oculomotor nerve
• B. Hypoglossal nerve
• C. Facial nerve
• D. Abducens nerve

Answer: (B)

The cranial nerve identified as CN XII is the Hypoglossal nerve. This nerve is primarily responsible for the motor control of the muscles of the tongue, which is essential for actions such as speaking, swallowing, and manipulating food. It plays a critical role in taste and the formation of speech by facilitating precise movements of the tongue.

Understanding the significance of the Hypoglossal nerve helps appreciate its function in various activities related to vocalization and oral movements. The other choices represent different cranial nerves with distinct functions: the Oculomotor nerve (CN III) controls most of the eye's movements, including the constriction of the pupil; the Facial nerve (CN VII) is involved in facial expressions and the sense of taste from the anterior two-thirds of the tongue; and the Abducens nerve (CN VI) is responsible for lateral eye movement. Each nerve plays unique roles in facial and sensory functions, underscoring the specific responsibilities of the Hypoglossal nerve as CN XII.