ASTRID & HANNS-FREIDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FREIDER MICHLER / SCIENCE PHOTO LIBRARY
Light micrograph of normal human thymus. The thymus is divided into lobules separated by septa of connective tissue (white spaces) which may contain blood vessels (as at right, stained red and very dark purple). Each lobule has a cortex (granular masses, densley packed, picture periphery) of lymphocytes, and a medulla (centre) of lymphocytes and stellate epitherial cells. The circular pink structures within the medulla (one prominent) are concentrically arranged epitherial cells of uncertain function. Magnificaton: x20 at 35mm size.
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