Intermediate Oculomotor Nerve Quiz

Q1. At approximately which midbrain level is the oculomotor nuclear complex located?

• Level of the superior colliculus
• Level of the inferior colliculus only
• Pontomedullary junction
• Upper medulla

Q2. Where does the oculomotor nerve emerge from the brainstem?

• Pontomedullary junction laterally
• Postolivary sulcus of the medulla
• Dorsal surface below the inferior colliculus
• Interpeduncular region of the ventral midbrain

Q3. Which major artery lies close to CN III as the nerve passes from the midbrain toward the cavernous sinus?

• Vertebral and anterior spinal arteries
• Middle meningeal and facial arteries
• Posterior cerebral and superior cerebellar arteries
• Anterior cerebral and ophthalmic arteries

Q4. Where does CN III travel in relation to the cavernous sinus?

• In the lateral wall of the cavernous sinus
• Inside the internal carotid artery
• Freely within the sphenoid sinus
• Within the optic nerve sheath

Q5. Into which two major divisions does CN III split before or as it enters the orbit?

• Medial and lateral divisions
• Anterior and posterior divisions
• Sensory and motor roots
• Superior and inferior divisions

Q6. Which muscles are supplied by the superior division of CN III?

• Medial rectus and inferior oblique
• Inferior rectus and lateral rectus
• Superior rectus and levator palpebrae superioris
• Superior oblique and medial rectus

Q7. Which group is supplied by the inferior division of CN III?

• Medial rectus, inferior rectus, and inferior oblique
• Superior oblique, lateral rectus, and medial rectus
• Lateral rectus, superior rectus, and orbicularis oculi
• Superior rectus, superior oblique, and levator palpebrae superioris

Q8. Which nerves carry postganglionic parasympathetic fibers from the ciliary ganglion to the sphincter pupillae?

• Lacrimal nerve
• Long ciliary nerves only
• Short ciliary nerves
• Frontal nerve

Q9. Which muscle supplied through the CN III parasympathetic pathway changes lens shape for near vision?

• Ciliary muscle
• Dilator pupillae
• Orbicularis oculi
• Superior tarsal muscle

Q10. Which part of the pupillary light reflex is carried by CN III?

• Afferent corneal sensory limb
• Efferent limb for pupillary constriction
• Efferent blink limb
• Afferent limb from the retina