Question

1. TRUE OR FALSE: High frequency nerve fibers course along the outer surface of the auditory nerve bundle.

2. Which cranial nerve is involved in sensory AND motor function of the tongue?

a. Trigeminal

b. Facial

c. Vagus

d. Glossopharyngeal

e. Hypoglossal

3. Select the structure or region innervated by the efferent fibers of each cranial nerve.

Trigeminal (V)

Facial (VII)

Glossopharyngeal (IX)

Vagus (X)

Hypoglossal (XII)

The choices are: Face, Larynx, Muscles of Mastication, None, Intrinsic & Extrinsic Tongue Muscles, Posterior 1/3 of Tongue

4. The vestibulocochlear nerve is primarily….

a. Efferent

b. Afferent

5. Most of the neurons that receive sensory information from the cochlea are attached to

a. OHCs

b. IHCs

6. Select the structure or region innervated by the afferent fibers of each cranial nerve.

Trigeminal (V)

Facial (VII)

Glossopharyngeal (IX)

Vagus (X)

Hypoglossal (XII)

The choices are: Anterior 2/3 of Tongue, None, Larynx, Face Lower Jaw Mouth, Posterior 1/3 of Tongue, Cochlea

Answer 1

ANSWER -

1. TRUE

- in cochlea the the auditory nerve fibers or hair cells are located within the organ of Corti.

- Stereocilia also called hair bundles which grow out of apical surface if the cell.

2. Glossopharyngeal nerve

- receives from the throat,tonsils , middle ear etc.

- also takes part in sensation of taste of toungue.

3. TRIGEMINAL N - BOTH SENSORY AND MOTOR. transmission of information of the skin.

GLOSSOPHARYNGEAL N - BOTH SENSORY AND MOTOR. control of general somatic sensory fibers.

VAGUS N - BOTH . regulate heart rate,blood pressure,speaking,digestion etc.

HYPOGLOSSAL N - MOTOR NEURON. controls extrinsic muscle and intrinsic muscle od the toungue.

4. AFFERENT

- Primarily considered as afferent neuron.

5. (B) Inner hair cells.

- receives more afferent inputs from inner hair cells comparing to outer hair cells.

6. TRIGEMINAL N - face lower jaw mouth.

FACIAL N - 2/3rd of anterior toungue

GLOSSOPHARYNGEAL N - 1/3rd of posterior toungue

VAGUS N - larynx

HYPOGLOSSAL N - NONE - But actually it controls extrinsic and intrinsic muscles of toungue.