Test 135  (Ocular anatomy)

1.  The sympathetic nerve supply to the lacrimal gland travels through 
      the following nerves:

a. deep petrosal nerve

b. greater petrosal nerve

c. maxillary nerve

d. zygomaticotemporal nerve

e. pterygopalatine ganglion 
 

Answer
a.T   b.F   c.T   d.T   e.T
The postganglionic fibers from the superior cervical sympathetic ganglion travel in the internal carotid 
plexus and join the deep petrosal nerve, nerve of the pterygoid canal, maxillary nerve, zygomatic nerve, 
zygomaticotemporal nerve and finally the lacrimal nerve.

2. True statements about the superior oblique muscle include:

a. it originates at the lesser wing of the sphenoid bone

b. it is innervated by the fourth cranial nerve on its upper 
    surface

c. the muscle turns tendinous before entering the trochlea

d. it passes beneath the superior rectus muscle to insert 
    onto the globe

e. it inserts on the globe at 45⁰ to the visual axis 

Answer
a.F   b.T   c.T   d.T   e.F
The superior oblique muscle originates at 
the body of the sphenoid bone. It inserts on
the globe at 54 degrees to the visual axis. 

3. The following are the action of superior oblique muscle: 

a. extortion

b. depression

c. adduction

d. elevation

e. intortion

Answera.F  b.T  c.F  d.F  e.T
The functions of the superior oblique muscles are intortion, depression and abduction.

4. The frontal nerve:

a. is the largest branch of the ophthalmic nerve

b. enters the orbit via the superior orbital fissure

c. gives rise to terminal branches before within the 
    orbit

d. supplies the lacrimal gland

e. supplies the skin at the tip of the nose
 

Answer
a.T   b.T  c.T   d.F   e.F
The lacrimal gland is supplied by the lacrimal 
nerve and the tip of the nose by the nasociliary nerve.

5. The lacrimal caruncle :

a. contains colourless hair

b. contains accessory lacrimal glands

c. is supplied by the superior medial palpebral arteries

d. is innervated by the supratrochlear nerve

e. is drained by the lymphatic drainage into the 
    submandibular gland
 

Answer
a.T   b.T  c.T  d.F   e.T
It is supplied by a infratrochlear nerve, a branch of the nasociliary nerve.

 

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