IHS Anatomy and Physiology of Hearing 5

Question 1

The tensor tympani muscle is innervated by which cranial nerve?

Accepted Answer

Trigeminal nerve (CN V)

Answer

The tensor tympani is innervated by the medial pterygoid nerve, a branch of the mandibular division (V3) of the trigeminal nerve (CN V).

Question 2

Which structure separates the scala media from the scala vestibuli?

Accepted Answer

Reissner's membrane

Answer

Reissner's membrane (vestibular membrane) forms the thin boundary between the endolymph-filled scala media and the perilymph-filled scala vestibuli.

Question 3

Presbycusis caused by degeneration of the stria vascularis is classified as which type?

Accepted Answer

Strial (metabolic) presbycusis

Answer

Strial or metabolic presbycusis results from atrophy of the stria vascularis, reducing the endocochlear potential and causing a relatively flat audiometric configuration.

Question 4

The utricle detects which type of head movement or position?

Accepted Answer

Linear acceleration and static tilt in the horizontal plane

Answer

The utricle's macula is oriented horizontally and responds to horizontal linear acceleration (such as moving forward) and head tilts relative to gravity.

Question 5

The number of inner hair cells in the human cochlea is approximately:

Accepted Answer

3,500

Answer

There are approximately 3,500 inner hair cells arranged in a single row along the length of the cochlea, and they are the primary sensory cells sending signals to the auditory nerve.

IHS - International Hearing Society Practice Test

IHS - International Hearing Society Practice Test

IHS Anatomy and Physiology of Hearing 5