Test 16
76. Regarding the eye:
a. it lies in the anterior part of the orbital cavity 

b. the superior and inferior orbital margins lie anterior to the eye 

c. it lies closer to the floor of the orbit than the roof 

d. focusing is due mainly to the lens 

e. a meridian is a line passing through the poles 

77. The lens:
a. has a greater radius of curvature in the posterior than the anterior 

b. makes upto 1/3 of the refractive power of the eye 

c. is of uniform refractive power throughout 

d. has a posterior epithelial surface 

e. metabolizes carbohydrate (glucose) only 

f. derives itís oxygen and nutrient supply from the aqueous 

g. produces glutathione 


78. the following statements are true about the lens:
a. the nucleus is formed in two stages 

b. the non dividing epithelial cells are cuboidal and highly active 

c. the epithelial cells are are joined by gap junctions 

d. it has a high water content 

e. it is attached to the ciliary body by the zonules of Tillaux 

f. it receives its blood supply in the fetus from the hyaloid artery 


79. The following statements are true:
a. a nucleus is a collection of cell bodies within the central nervous 

b. grey matter represents myelinated axons 

c. the prosencephalon is the midbrain 

d. the rhombencephalon is composed of the metencephalon, the 
    myelencephalon and the mesencephalon 

e. the telencephalon are interconnected by the corpus callosum 

f. the cerebral hemispheres contain the lateral ventricles 


80. The brain:

a. is bathed in cerebrospinal fluid 

b. is closely covered by dura mater 

c. develops from mesoderm 

d. contains 4 lobes in the cerebellum 

e. is heavier in males than in females 

To test 17
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