Test 17 (modified from Oct, 1999)

1. The function of the superior rectus muscle include:

a. elevation of the globe

b. abduction of the globe

c. intortion of the globe

d. retraction of the globe

e. moving the eyelid upward

Answera.T   b.F   c.T   d.T   e.T
The superior rectus is involved in: elevation, medially rotate and intort the globe.
Contraction of the globe also helps to retract the globe. 
It helps to elevate the eyelid as shown by the ptosis in superior rectus palsy.
Learn all the details about the extraocular muscles as they are favourite MCQs and short question materials. In the MCQs, you may be asked questions on details which you cannot recall because you think they are not important for instance, where the nerve enters the muscles, which has the longest muscle, which has the longest tendon, the distance from muscle to the limbus and the types of muscle present in the extraocular muscles.
 
 

2. The following structures pass through the annulus of Zinn:

a. superior ophthalmic vein

b. trochlear nerve

c. superior division of the oculomotor nerve

d. inferior division of the oculomotor nerve

e. nasociliary nerve

Answera.F   b.F   c.T   d.T   e.T
Structures passing through the annulus of Zinn are:
Optic nerve and ophthalmic artery
Oculomotor nerve (both superior and inferior branches)
Abducent nerve
Nasociliary nerve.
MCQs in the part I are full of holes and cracks where different structures are transmitted. Go back to your medical student day and try to recall foramen this and that.
 

3. The following are branches of the ophthalmic nerve:

a. frontal nerve

b. nasociliary nerve

c. lacrimal nerve

d. meningeal nerve

e. zygomatic nerve

Answera.T   b.T   c.T   d.F   e.F
This is a popular questions look up all the branches of the ophthalmic and maxillary nerves.
 
 

4. The cavernous sinus:

a. contains arterial blood

b. is related laterally to the trochlear nerve

c. is related laterally to the abducent nerve

d. is related medially to the sphenoid sinus

e. drains directly into the superior petrosal sinus

Answera.F   b.T   c.F   d.T   e.T
Another popular questions, it comes up regular in the MCQs and short questions. Learn to draw the structures of the cavernous sinus and this well help you to score in the short questions.
 
 

5. The inferior rectus muscle:

a. originates entirely from the annulus of Zinn

b. is the shortest of the four recti muscle

c. intorts the globe

d. adducts the globe

e. is inserted furthest from the limbus than other extraocular muscles.
 

Answera.T   b.T   c.F   d.F   .e.F
Inferior rectus depresses, medially rotates and extorts the globe.
The distance between the insertion of the rectus and the limbus from the shortest to the longest are:
medial rectus, inferior rectus, lateral rectus and superior rectus.

 

More MCQs