Nerve deafness would most likely result from an injury or infection that damaged the:
A. Vagus nerve
B. Cochlear nerve
C. Vestibular nerve
D. Trigeminal nerve
Correct Answer: B. Cochlear nerve.
Because the organ of hearing is the organ of Corti, located in the cochlea, nerve deafness would most likely accompany damage to the cochlear nerve. The cochlear nerve is responsible for transmitting auditory signals from the inner ear to the cochlear nuclei, within the brainstem, and ultimately to the primary auditory cortex, within the temporal lobe.
Option A: The vagus nerve (cranial nerve [CN] X) is the longest cranial nerve in the body, containing both motor and sensory functions in both the afferent and efferent regards. The nerve travels widely throughout the body affecting several organ systems and regions of the body, such as the tongue, pharynx, heart, and gastrointestinal system.
Option C: The vestibular nerve relays information related to motion and position. The vestibular system involves coordinated communication between the vestibular apparatus (semicircular canals, saccule, and utricle), ocular muscles, postural muscles, brainstem, and cerebral cortex.
Option D: The trigeminal nerve is the fifth cranial nerve (CN V). Its primary function is to provide sensory and motor innervation to the face. The trigeminal nerve consists of three branches on either side that extend to different territories of the face. These branches join at the trigeminal ganglia which are located within the Meckel cave of the cranial cavity.
No comments:
Post a Comment