a. it passes between the superior rectus and the globe on the way to its insertion

b. it has the shortest active muscle

c. it becomes tendinous before reaching the trochlea

d. it is the primary extorter of the globe in the primary position

e. it acts as a pure elevator when the globe is adducted 51 degrees

answera.T   b.T   c.T   d.F   e.T
It is the primary intorter of the globe in the primary position.

2. The inferior oblique muscle:

a. has the shortest tendon of all extraocular muscle

b. arises from the anterolateral orbital floor

c. passes between the inferior rectus and the globe on the way to its insertion

d. is involves in elevating the globe in the primary position

e. is innervated by the inferior division of the oculomotor nerve

answera.T   b.F   c.T   d.T   e.T
It arises from the anteromedial orbital floor.
Although it acts as a primary extorter in the primary position, it also contributes to elevation of the globe in the primary position.

3. The medial rectus:

a. is the largest extraocular muscle

b. is attached to the dural sheath of the optic nerve

c. is supplied by the superior branch of the oculomotor nerve

d. has the nasociliary nerve running superiorly 

e. its insertion is nearer to the limbus than the inferior rectus

answera.T   b.T   c.F   d.T    e.T
It is supplied by the inferior division of the oculomotor nerve

4. The trochlea:

a. is made up of a small circular bone

b. is attached to the frontal bone

c. contains a synovial sheath that surrounds the tendon of the superior oblique

d. is situated medial to the supraorbital nerve

e. divides the preaponeurotic fat into the medial and lateral fat pad.

answera.F   b.T   c.T   d.T   e.T
It is a fibrocartilage.

5. The following are true:

a. at the site of globe insertion, the inferior oblique muscle is covered by the lateral 
    rectus

b. the superior oblique muscle is inserted anterior to the equator

c. the lateral rectus has an origin from the lesser wing of the sphenoid bone

d. the lateral rectus is supplied by the abducent nerve on its lateral surface

e. the superior rectus is inserted closer to the limbus than the inferior rectus

answera.T   b.F   c.F   d.F   e.F
The superior oblique muscle inserts posterior to the equator.
The lateral rectus has two origins one from the greater wing of the sphenoid and the other from the tendinous ring.
The lateral rectus is supplied by the abducent nerve on its medial surface.
The inferior rectus is inserted closer to the limbus than the superior rectus.

6. The trochlear nerve:

a. is a pure motor nerve

b. exits the midbrain below the inferior colliculus

c. decussates completely after it emerges from the midbrain

d. lies on the medial wall of the cavernous sinus as it passes forward into the orbit

e. causes hypertropia of the globe if it is paralysed

answera.T   b.T   c.F   d.F   e.T
It decussates before leaving the midbrain. In the cavernous sinus, it lies on the lateral wall.

7. The long ciliary nerve:

a. is a branch of the supraorbital nerve

b. enters the globe at the equator

c. contains parasympathetic nerve fibres

d. synapse at the ciliary ganglion

e. contains sensory fibres from the cornea.

answera.F   b.F   c.F   d.F   e.T
The long ciliary nerve is a branch of the nasociliary nerve.
It enters the globe near the attachment of the optic nerve.
It contains sympathetic nerve to the dilator pupillae of the iris and sensory nerve from the cornea.

8. The ophthalmic nerve:

a. is the biggest branch of the trigeminal nerve

b. is a purely sensory nerve

c. receives sympathetic fibres from the internal carotid plexus

d. give off three main branches after it enters the orbit

e. lies below the trochlear nerve in the cavernous sinus

answera.F   b.T   c.T   d.F   e.T
It is the smallest branch of the trigeminal nerve.
It gives off three branches before entering the orbit.

9. The following structures are involved in the accommodation reflex:

a. lateral geniculate body

b. visual cortex

c. Edinger-Westphal nuclei

d. ciliary ganglion

e. short ciliary nerves

answera.T   b.T   c.T   d.T   e.T

10. A lesion involving the facial nerve in the facial canal will give rise to:

a. loss of taste to the anterior two third of the tongue

b. hyperacusis

c. loss of lacrimation

d. decreased blinking

e. paralysis of the orbicularis oculi

answera.T   b.T   c.F   d.T   e.T
Lesion in the facial canal will lead to:
paralysis of the facial nerve and therefore paralysis of the muscles of  facial expression and decreased blinking.
hyperacusis due to paralysis of the nerve to the stapedius
loss of taste to the anterior two third of the tongue due to paralysis of the chorda tympani

The nerve to the lacrimal nerve is given off before the facial nerve enters the facial canal.