Which cranial nerve is numbered XII?

Which cranial nerve is numbered XII?

• A. Hypoglossal nerve (XII)
• B. Abducens (VI)
• C. Vestibulocochlear (VIII)
• D. Trigeminal (V)

Answer: (A)

Cranial nerves are numbered in order of their emergence from the brainstem using Roman numerals. The nerve named for the tongue is the one associated with XII in that order. The hypoglossal nerve is a somatic motor nerve that innervates most of the tongue’s intrinsic and extrinsic muscles, enabling movements needed for speech and swallowing. It exits the skull through the hypoglossal canal and travels to the tongue to control its motion. The other nerves listed have different roles: one moves the eye laterally, another carries hearing and balance information, and another provides facial sensation and chewing. So the nerve that aligns with the XII numbering is the hypoglossal nerve.

Cranial nerves are numbered in order of their emergence from the brainstem using Roman numerals. The nerve named for the tongue is the one associated with XII in that order. The hypoglossal nerve is a somatic motor nerve that innervates most of the tongue’s intrinsic and extrinsic muscles, enabling movements needed for speech and swallowing. It exits the skull through the hypoglossal canal and travels to the tongue to control its motion. The other nerves listed have different roles: one moves the eye laterally, another carries hearing and balance information, and another provides facial sensation and chewing. So the nerve that aligns with the XII numbering is the hypoglossal nerve.