October 17, 2010

USMLE 1 Question 14

The aqueous humour of the eye may be divided into an anterior chamber and a posterior chamber.

What mostly tends to seperate these chambers?

a) lens
b) cornea
c) iris
d) limbus
e) ciliary processes

The correct answer is C

The iris is an annular membrane dividing the aqueous humour into the anterior chamber, nearer the cornea, and the posterior chamber, towards the lens.

The inner portion of the iris, the pupillary zone, is separated from the ciliary zone by the zig-zagging collarette.

The colour of eyes is determined by the amount of pigment in the iris. With no pigment the eyes appear blue; with increasing amounts of pigment the colour tends towards grey, brown and black.

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