Test 79    (Ocular anatomy)
1. The Bruch's membrane:
a. is 10 um in thickness
b. contains the basement membrane of the choriocapillaris
c. increases in thickness with age
d. forms part of the blood-retina barrier
e. is abnormal in Ehler-Danlos' syndrome

2. The following are true about the iris:

a. it contains pigmented epithelium on its anterior surface.
b. it contains melanocytes in the stroma that determines 
    the iris colour
c. its colour is determined by sympathetic innervations
d. the dilator muscle is innervated by the sympathetic 
e. the constrictor muscle is innervated by the 
    parasympathetic system

3. The sclera:

a. contains 50% of water
b. contains mainly type I and III collagen
c. is thinnest near the limbus
d. is penetrated by four vortex veins at its equator
e. forms the lamina cribrosa in the optic nerve region

4. Third nerve palsy with pupil sparing is seen in the following 

a. hypetension
b. diabetes mellitus
c. aneurysm of the posterior communicating artery
d. internal carotid artery aneurysm within the cavernous
e. uncal herniation

5. The following are true about the optic nerve :

a. it is made up of second order neurone
b. the average length in adult is 25 mm
c. the intraocular part is the thickest
d. the intraorbital part is the longest
e. the Schwann cells provide the myelination

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