Advanced Health Assessment Practice Exam

Cranial nerve VIII is primarily associated with which of the following functions?

1. Facial expression

2. Hearing and equilibrium

3. Parasympathetic innervation

4. Muscle movement of the tongue

The correct answer is: Hearing and equilibrium

Cranial nerve VIII, also known as the vestibulocochlear nerve, is primarily responsible for two key functions: hearing and equilibrium. This nerve is divided into two components: the cochlear nerve, which is involved in transmitting sound information from the cochlea of the inner ear to the brain, and the vestibular nerve, which is responsible for sensing changes in head position and movement, thus aiding in balance and spatial orientation. When it comes to functions associated with cranial nerves, it’s important to understand that each one has specific roles. The other listed options pertain to different cranial nerves and their respective functions. For instance, facial expression is primarily managed by cranial nerve VII (the facial nerve), parasympathetic innervation is often associated with cranial nerves III (oculomotor), VII (facial), IX (glossopharyngeal), and X (vagus), while muscle movement of the tongue is mainly controlled by cranial nerve XII (hypoglossal). Understanding the specific roles of cranial nerves is crucial for effectively diagnosing and managing neurological conditions. Thus, recognizing that cranial nerve VIII is exclusively linked to hearing and balance helps clarify its importance in the assessment of auditory and vestibular functions