Download SESSION 2 - Eyelids, Orbit And Nerves Entering It

SESSION 2 - Eyelids, Orbit And Nerves Entering It
1. Which 2 extrinsic eye muscles act together to look directly up?
2. Why cannot the superior rectus perform this task by itself?
3. If the superior oblique turns the eye down and out, why do we test this muscle by
asking the patient to look down and in?
4. Which 2 extrinsic eye muscles are not supplied by the oculomotor nerve (III)?
5. Does the posterior chamber of the eye lie anterior or posterior to the lens?
6. Do tears move from medial to lateral or vice versa on blinking?
7. What are the eye signs in Horner's syndrome?
8. Meibomian glands are modified ………… glands.
9. During accommodation (looking at close objects) does the lens become fatter or
thinner and why?
10. Which part of which muscle causes excess tears to pour down the cheeks?
11. What prevents the layer of tears on the cornea from drying out more quickly than it
does?
12. Excessive tears pass down the nasolacrimal duct. Where does it empty?
13. Via which parasympathetic ganglion do the secretomotor fibres for the lacrimal gland
pass?
14. When an upper eyelid is turned inside out to look for a foreign body, what structure is
holding the eyelid in this abnormal position?
15. In skin it might be called a carbuncle but in the lid it is called a ….?
16. Which two muscles are used together to look directly downwards?
17. Which cranial nerve lies most medially in the cavernous sinus?
18. Does the oculomotor nerve divide into its superior and inferior divisions before or
after it passes through the tendinous ring?
19. Which three "orbit" muscles do not attach to the tendinous ring?
20. What is nystagmus?
21. You shine a torch into a blind right eye. Would you get a pupillary reaction to light in
(a) the right eye, (b) the good left eye?
22. You shine a torch in a good left eye. Would you get a pupillary reaction to light in (a)
the good left eye, (b) the right blind eye?
23. In a lesion of the oculomotor (III) nerve where would the eye be pointing and why?
24. In a lesion of the oculomotor (III) nerve why is there ptosis, proptosis and a dilated
pupil?
25. What is the mechanism of damage to the III, IV and VI cranial nerves in raised
intracranial pressure? What would be the effect of damage to the IV and VI nerves
individually?
26. Which part of which bone does the trigeminal ganglion lie on?
27. What is the relation of the trigeminal ganglion to the cavernous sinus?
28. Does the smaller motor root of the trigeminal nerve pass through the trigeminal
ganglion?
29. Which of the 3 divisions of the trigeminal nerve is the motor root associated with?
30. Apart from sensory fibres to skin, what other fibres does the lacrimal nerve carry?
31. Which branch of which division of the trigeminal nerve carries sensory fibres to the
dura of the anterior cranial fossa?
32. How do the sympathetic fibres that dilate the pupil reach the long ciliary branches of
the nasociliary nerve?
33. Which structure gives the "blind spot" on the retina?
34. What 4 other structures pass through the optic canal with the optic nerve?
35. If the sympathetic chain is damaged in the neck, there will be two eye signs. What are
they?
36. Which two cranial nerves are involved in the motor/sensory limbs of the corneal
reflex?