MICHAEL ROSS / SCIENCE PHOTO LIBRARY MICHAEL ROSS / SCIENCE PHOTO LIBRARY
Light micrograph showing the zona reticularis, the inner layer of the adrenal gland cortex, the outer layer of a type of endocrine gland, on one side of the micrograph. This portion of the cortex ends adjacent to the medulla, the inner core of the organ. The cells of the medulla are larger than those of the zona reticularis and are arranged in ovoid clusters and short cords. This micrograph also shows a cross section of a central or medullary vein. On one side of the vein, near the edge of the micrograph, are bundles of smooth muscle cells that course in a direction parallel to the vein.
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