Test 17
81. With regard to the cornea:
a. it consists of 4 layers 

b. surface ectoderm gives rise to the epithelium and Bowmanís layer 

c. in the fetus it is more hydrated than in the adult 

d. Descementís layer is synthesized by the endothelium 

e. the stroma layer arises from the mesenchyme 


 


82. With regard to the cornea:

a. it consists of 4 layers 

b. surface ectoderm gives rise to the epithelium and Bowmanís layer 

c. in the fetus it is more hydrated than in the adult 

d. Descementís layer is synthesized by the endothelium 

e. the stroma layer arises from the mesenchyme 


 
 

83. The pupil:
a. varies between 4 and 10mm in diameter 

b. is of the same size unless pathology exists 

c. controls light entering the eye 

d. miosis is the result of sphincter pupillae action under sympathetic 
    control 

e. mydriasis is due to dilator pupillae relaxation 


 
 

84. The iris:
a. is the most anterior extension of the uveal tract 

b. divides the anterior segment into the anterior and posterior 
    chambers 

c. is often cancave anteriorly due to the lens bulge 

d. has a region called the collarette which lies 2mm from the 
    pupillary margin 

e. receives innervation from the long and short ciliary nerves 


 
 

85. The iris:
a. receives itís blood supply from the long posterior ciliary and 
    anterior ciliary arteries 

b. a complete minor arterial circle is found at the collarette 

c. drains into the vorticose veins 

d. contains fenestrated vessels 

e. has vessels with well developed tunica adventitia 

 
To test 18
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