Orbit & brain stem 2025 Quiz

Which bone forms the superior margin of the orbit?

• Maxilla

• Zygomatic

• Frontal

• Ethmoid

What is the weakest wall of the orbital cavity?

• Roof

• Floor

• Medial

• Lateral

Which muscle is responsible for abduction of the eyeball?

• Medial rectus

• Inferior oblique

• Lateral rectus

• Superior rectus

The superior oblique muscle is supplied by which cranial nerve?

• Oculomotor

• Abducent

• Trochlear

• Trigeminal

Which nerve passes through the inferior orbital fissure?

• Optic nerve

• Infraorbital nerve

• Frontal nerve

• Trochlear nerve

Horner's syndrome is due to a lesion affecting which fibers?

• Parasympathetic

• Sympathetic

• Trochlear nerve

• Abducent

Which muscle depresses the adducted eye?

• Superior rectus

• Inferior oblique

• Superior oblique

• Lateral rectus

Which structure in the brainstem contains the pyramidal decussation?

• Pons

• Midbrain

• Medulla oblongata

• Cerebellum

Which cranial nerve exits through the preolivary sulcus?

• Vagus

• Glossopharyngeal

• Hypoglossal

• Accessory

The cerebellopontine angle contains which cranial nerves?

• 5, 6, 7

• 7, 8, 9

• 9, 10, 11

• 4, 5, 6