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Lymphoid histology (Lymphoid organs (Lymph nodes (secondary) (Medullary…

- - - - Cortex
      - Medulla
        
        Hassall's corpuscles
      - Septum
  - - - Trabeculae
    - - Reservoir of concentrated RBCs
    - - PALS
        (Periarterial lymphatic sheaths)
  - - - Medullary sinuses
- - - - Hassall's corpuscles
      - Central pale staining
    - - Darker outer region (high conc. of L.cytes)
  - - - Dark region
    - - Pale region
    - - Germinal centres, dark out ring with pale inner ring
        
        Activated B cells become large and pale with lots of cytoplasm hence pale stain