Washington Esthetician State Board Practice Exam

What type of nerve is the seventh cranial nerve?

1. Sensory nerve

2. Motor nerve

3. Mixed nerve

4. Reflex nerve

The correct answer is: Motor nerve

The seventh cranial nerve, also known as the facial nerve, is primarily a motor nerve because it is responsible for controlling the muscles of facial expression. It innervates various muscles that allow expressions such as smiling and frowning, making it crucial for conveying emotions. In addition to its motor functions, the facial nerve also carries some sensory fibers and parasympathetic fibers, which provide taste sensations from the anterior two-thirds of the tongue and innervate salivary glands, respectively. However, its dominant role is motor control in facial expressions, solidifying its classification as a motor nerve. In contrast, sensory nerves are responsible for transmitting sensory information from peripheral receptors to the central nervous system, while mixed nerves contain both sensory and motor fibers. Reflex nerves are not a formal classification of cranial nerves but rather refer to the neural pathways involved in reflexes. Thus, the designation of the facial nerve as a motor nerve accurately reflects its primary function.