AB2.H2.7 Thymus

Lymph Nodes - Function:

  • The thymus is a lymphoid organ
  • The thymus is different from other lymphoid organs both in terms of its structure and in its function
  • Structurally, the thymus consists of supporting cells and lymphocytes
  • However, unlike in other lymphoid organs, the supporting cells are epithelial cells which form a three dimensional framework in which the lymphocytes are supported
  • The thymus is divided into lobes and lobules by thin connective tissue septae
  • Each lobule has a cortex and a medulla
  • In the cortex there is a high density of small lymphocytes
  • These lymphocytes proliferate
  • In the medullary regions, the density of small lymphocytes is less than in the cortex
  • Functionally, the thymus is a site of the production of T lymphocytes
  • It is not a site at which foreign antigens are monitored
  • The T lymphocytes produced in the thymus are distributed in the blood to other lymphoid organs such as the spleen and lymph nodes, and to areas of non-encapsulated lymphoid tissue
  • In these areas, the T lymphocytes produced in the thymus will participate in immune functions

Questions:

    Where is the thymus located?