Which cranial nerve is evaluated when assessing for Bell's palsy?

When assessing for Bell's palsy, the cranial nerve evaluated is the facial nerve, known as CN VII. This condition is characterized by sudden weakness or paralysis of the muscles on one side of the face, which is directly related to the function of the facial nerve. The facial nerve controls the muscles responsible for facial expressions, and its impairment results in the hallmark signs of Bell's palsy, such as drooping of the mouth and eyelid on the affected side.

Additionally, the facial nerve plays a role in taste sensation for the anterior two-thirds of the tongue and carries some autonomic functions for salivary glands. Therefore, clinical evaluation focuses on observing facial symmetry, voluntary movements, and reflexes to assess the integrity of CN VII. Assessing other cranial nerves listed does not directly diagnose or evaluate Bell's palsy, underscoring the importance of CN VII in this specific context.