Final answer:
The hypoglossal nerve, or CNXII, is purely a motor nerve, responsible for controlling the movements of the muscles of the tongue. It does not have a sensory function and is essential for speech and swallowing.
Step-by-step explanation:
The Hypoglossal Nerve (CN XII)
The hypoglossal nerve, which is also known as the twelfth cranial nerve or CNXII, is responsible for the motor control of the muscles of the tongue. It plays a crucial role in various tongue movements essential for speech and swallowing. According to the mnemonic 'Some Say Marry Money But My Brother Says Brains Beauty Matter More', each word corresponds to whether a cranial nerve is sensory, motor, or both. This mnemonic indicates that the hypoglossal nerve is strictly motor, as confirmed by the information provided. Unlike the facial and glossopharyngeal nerves, which are associated with taste (sensory function) and salivation (motor function), the hypoglossal nerve does not have a sensory component and is solely involved in enabling tongue movements.