Final answer:
The vagus nerve (CN X) is a mixed nerve with both sensory and motor functions, contributing to autonomic activities and taste sensation.
Step-by-step explanation:
The vagus nerve (CN X) is a cranial nerve that contains both sensory and motor fibers, classifying it as a mixed nerve. Within the mnemonic 'Some Say Marry Money But My Brother Says Brains Beauty Matter More,' corresponding to the basic function of each cranial nerve, the vagus nerve would align with 'Matter More' indicating it has both motor and sensory functions.
The vagus nerve plays a critical role in autonomic functions in the thoracic and superior abdominal cavities, such as regulating heart rate, digestive tract movement, and sending taste sensations to the brain.