Multiple choice

Which of the following lymphoid tissues is unencapsulated?

  1. Thymus

  2. Lymph node

  3. Spleen

  4. Tonsil

  5. MALT
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The respiratory, alimentary and genitourinary tracts are guarded immunologically by subepithelial accumulations of lymphoid tissues, which are not constrained by a connective tissue capsule. These may occur as diffuse collections of lymphocytes, plasma cells and phagocytes throughout the body and the lamina propria of the intestinal wall or as more clearly organised tissue with well-formed follicles as found in the Peyer's patches.

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