Primary Lymphoid Organs (Example: Thymus, Bone marrow, Bursa of Fabricius)

1. The lymphoid stem cells proliferate, differentiate and mature

2. Contain either B cells or Tcells

3. Antigen cannot enter  in

4.They atrophy with age
Secondary Lymphoid Organs ( Example: Spleen, Lymph nodes, Peyers patches, Tonsils)

1. The lymphoid cells become functional

2. Contain both T and B cells.

3. Antigen enters in and stimulates the lymphoid cells

4. They increase in size with age

6 Comments

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  1. Very educative site.....I love this place.....

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  2. Never thought such amazing educative sites are there.
    My hearty congratulation to the team.
    Jitendra jain

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  3. Thank you for such a site... Great work.. Keep it up!!.. :-)

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  4. difference btw chimeric and complementary dna

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