Spleen structure: White pulp Lymphatic nodules with central
arteries Periarterial lymphatic sheaths (PALS) Red pulp Trabecules
with arteries and veins Cords of Billroth
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Thymus gland structure: Thymic lobule is a structural unit,
consisting of epithelioreticulocytes infiltrated with thymocytes
(T-lymphocytes). Each lobule includes: Cortex + Medulla (including
Hassal corpuscles) During ageing thymus undergoes involution
resulting in transformation into corpus adiposum Under stressfull
conditions thymus undergoes accidental involution
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Red bone marrow: Location: flat bones and epiphysial parts of
long bones Structure: Osseous trabecules of spongy bones Reticular
connective tissue Pluripotent hemopoetic cells with clasters of
differentiating red and white blood cells