Choroid
Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.
The choroid or choroid coat, in the rear five-sixths of the globe of the eye, is loosely joined to the sclera and is honeycombed with blood vessels that provide nourishment to surrounding tissues. The choroid also contains numerous pigment-producing hormone cells that give it a brownish black appearance. The dark pigments of these cells absorb excess light and help keep the inside of the eye dark.
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