Which cranial nerve is associated with facial expressions?

The cranial nerve associated with facial expressions is the facial nerve, also known as cranial nerve VII. This nerve is primarily responsible for the movement of the muscles used in facial expressions, allowing individuals to convey a wide range of emotions through their facial movements, such as smiling, frowning, and raising their eyebrows.

Additionally, the facial nerve has autonomic functions, including the secretion of saliva and tears, but its main role in controlling the muscles of facial expression makes it crucial for non-verbal communication.

In contrast, the other cranial nerves listed have distinct functions: the abducens (CN 6) primarily controls lateral eye movement; the glossopharyngeal (CN 9) is involved in taste and swallowing, and the hypoglossal (CN 12) innervates the muscles of the tongue. These specific roles highlight why only the facial nerve is correct in relation to facial expression.