Medulla of thymus. Light micrograph of a section through the medulla of a healthy thymus. The thymus is a gland at the base of the neck that is involv

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Medulla of thymus. Light micrograph of a section through the medulla of a healthy thymus. The thymus is a gland at the base of the neck that is involved in immune system development. At upper left is a Hassal's corpuscle (purple oval), an obscure cyst-like structure that may be a degenerated epithelial cell. At bottom centre are blood vessels. Within the tissue of the medulla are maturing T-lymphocytes (dark red), a type of immune cell. They migrate into the medulla from the thymus's outer cortex, before re-entering general circulation. Magnification unknown.

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Photo credit: © CNRI/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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Keywords: -cells, -lymphocytes, anatomy, arteries, blood, body, corpuscle, hassals, healthy, histological, histology, human, immune, immunity, immunology, lymphocyte, lymphoid, medulla, normal, section, sectioned, slide, stain, stained, system, thymus, veins, vessel, vessels