Lymph node : Histological features with easy drawing idea

Lymph node: 

1. It is the one of the important lymphatic organ. 
2. It is a secondary lymphatic organ 
3. It has one efferent lymph vessel but many afferent lymphatic vessel 
4. Its efferent lymphatic vessel leave through hilum 
5. Its afferent lymphatic vessels enter to this organ at different location 
6. It is covered by capsule
7. It has two part outer cortex and inner medulla 
8. Outer cortex contain lymphatic nodule 

Lymphatic nodule: 

A round shape structure, which is formed by aggregation of lymphocytes

It is darkly stain (deep blue) because lymphocyte contain big nucleus with little cytoplasm

Which lymphatic organ contain lymphatic nodules?

Ans:  

1. Lymph node 
2. Spleen 
3. Tonsil 

GULT: Gut associate lymphatic tissue contain aggregation of lymphocyte mainly in initial and terminal part of alimentary tract 

BULT: Bronchus associate lymphatic tissue contain aggregation of lymphocyte at initial part of respiratory system 

Germinal center: 

A pale stain area within the lymphatic node 

It contains B Lymphocyte 

Why this area pale ? 

It contain immature lymphocyte 

the cytoplasm of immature lymphocyte is bigger the nucleus and the number of cells are less so this area seem to paler than periphery 

 Special feature for identification of histological slide :

1. Subscapsular sinus is present ( unique feature of Lymph node) 
2. It has two parts outer cortex and inner medulla 
3. Outer cortex contain lymphatic nodule