Anhui Medical University 3.lymphoid organs Central lymphoid organs Thymus:the developing site of T cell Bone marrow:the developing site of B cell Peripheral lymphoid organs Lymph node Spleen Tonsil
Anhui Medical University Central lymphoid organs Thymus: the developing site of T cell Bone marrow: the developing site of B cell Peripheral lymphoid organs Lymph node Spleen Tonsil 3. lymphoid organs
Anhui Medical University >Features of central lymphoid organs: develop earlier (fetal period place for stem cells to proliferate and differentiate send lymphocytes to peripheral lymphoid organs two weeks before born
Anhui Medical University Features of central lymphoid organs: develop earlier (fetal period ) place for stem cells to proliferate and differentiate send lymphocytes to peripheral lymphoid organs two weeks before born
Anhui Medical University >Features of Peripheral lymphoid organs: Develop later (after birth) lymphocytes come from central lymphoid organs cell proliferation need antigen stimulating antigen dependent) site of immune reactions take place
Anhui Medical University Features of Peripheral lymphoid organs: Develop later (after birth) lymphocytes come from central lymphoid organs cell proliferation need antigen stimulating ( antigen dependent) site of immune reactions take place
Anhui Medical University II.Thymus At birth the thymus weighs 10~15g. increases to 30~40g at puberty, then undergoes involution after puberty. much of the organ is gradually replaced by fat tissue in elderly one. However,the thymus is believed to produce T-lymphocytes throughout life
Anhui Medical University At birth the thymus weighs 10～15g. increases to 30～40g at puberty, then undergoes involution after puberty. much of the organ is gradually replaced by fat tissue in elderly one. However, the thymus is believed to produce T-lymphocytes throughout life. Ⅱ. Thymus
Anhui Medical University Thymus of the elderly
Anhui Medical University Thymus of the elderly