MCQ Quiz

1. Stimulation of which nerve supplying the external auditory meatus may produce a cough reflex?

Auriculotemporal nerve

Great auricular nerve

Auricular branch of vagus nerve

Facial nerve

Explanation:
Arnold’s nerve (auricular branch of the vagus) can trigger the cough reflex when stimulated.

2. The elastic cartilage of the external auditory meatus is found in which part?

Medial two-thirds

Lateral one-third

Entire length

Only at tympanic membrane

Explanation:
The outer (lateral) one-third is cartilaginous and contains hairs and ceruminous glands.

3. The tegmen tympani separates the middle ear from which structure?

Temporal lobe of brain

Internal carotid artery

Sigmoid sinus

Nasopharynx

Explanation:
The tegmen tympani forms the roof and separates the tympanic cavity from the middle cranial fossa.

4. The tendon of stapedius muscle emerges from which middle ear structure?

Aditus

Promontory

Tympanic sulcus

Pyramid

Explanation:
The pyramid is a hollow conical projection giving origin to the stapedius tendon.

5. The promontory of the middle ear is produced by:

First turn of the cochlea

Vestibule

Facial nerve canal

Semicircular canals

Explanation:
The promontory results from the bulge of the first basal turn of the cochlea.

6. The perilymph of scala vestibuli lies medial to which structure?

Round window

Secondary tympanic membrane

Base of stapes

Handle of malleus

Explanation:
The base of the stapes closes the oval window and separates middle ear from perilymph.

7. Pars flaccida of the tympanic membrane is bounded by:

Handle of malleus

Anterior and posterior malleolar folds

Tympanic sulcus

Umbo

Explanation:
Pars flaccida is the small slack triangular area between malleolar folds.

8. The cone of light is seen at which position in the right ear?

7 o’clock

9 o’clock

6 o’clock

5 o’clock

Explanation:
In otoscopy, the cone of light is at 5 o’clock in the right ear.

9. Which ossicle articulates directly with the tympanic membrane?

Malleus

Incus

Stapes

None

Explanation:
The handle of the malleus is firmly attached to the tympanic membrane.

10. The stapedius muscle is innervated by:

Trigeminal nerve

Glossopharyngeal nerve

Facial nerve

Vagus nerve

Explanation:
Stapedius is supplied by the facial nerve (CN VII).

11. The auditory (Eustachian) tube primarily functions to:

Transmit sound

Equalize air pressure

Drain perilymph

Protect ossicles

Explanation:
It equalizes pressure between middle ear and nasopharynx.

12. The posterior wall of the mastoid antrum is related to:

Internal carotid artery

Temporal lobe

Internal jugular vein

Sigmoid sinus and cerebellum

Explanation:
Posteriorly, the mastoid antrum is related to the sigmoid sinus and cerebellum.

13. Which semicircular canal lies horizontally?

Lateral

Posterior

Superior

Common crus

Explanation:
The lateral semicircular canal is horizontally placed.

14. Perilymph is found within the:

Membranous labyrinth

Endolymphatic sac

Bony labyrinth

Cochlear duct

Explanation:
Perilymph fills the bony labyrinth.

15. The promontory seen in the middle ear corresponds to which cochlear part?

Helicotrema

First basal turn

Scala media

Modiolus apex

Explanation:
The first basal turn of the cochlea produces the promontory.

16. The scala tympani ends at the:

Oval window

Helicotrema

Internal acoustic meatus

Round window

Explanation:
Scala tympani ends at the round window (fenestra cochleae).

17. The organ of Corti rests on which membrane?

Basilar membrane

Vestibular membrane

Tectorial membrane

Spiral ligament

Explanation:
The basilar membrane supports the organ of Corti.

18. The utricle and saccule detect:

Rotational movement

Sound vibration

Linear acceleration and gravity

Pitch

Explanation:
Otolith organs detect head position and linear acceleration.

19. Cell bodies of cochlear nerve fibers are located in:

Vestibular ganglion

Spiral ganglion

Geniculate ganglion

Inferior colliculus

Explanation:
Cochlear nerve fibers arise from neurons in the spiral ganglion.

20. Most cochlear nucleus fibers project to:

Ipsilateral side only

Vestibular nuclei

Cerebellum

Contralateral superior olivary nucleus

Explanation:
Most fibers cross and ascend contralaterally in the auditory pathway.

21. The lateral lemniscus mainly terminates in the:

Medial geniculate body

Superior colliculus