Fig.11 93W4126 Thymus, H&E. Examination of the thymus at
low magnification reveals the lobules separated by adipose
tissue (Ad). In the older thymus, much adipose tissue is
present between the lobules. Each lobule is composed of a
dark-staining basophilic cortex (C) and a lighter-staining
medulla (M). The cortex contains numerous densely packed
lymphocytes, whereas the medulla contains fewer
lymphocytes and is consequently less densely. The lobules
are not completely separate units; rather, they are
interconnected.