Lymph node : easy and brief description

Lymph node

Lymph nodes are small encapsulated organs located along the pathway of lymphatic vessels   

Diameter: 1mm to 2 cm

Two types of lymphatic vessels are connected with lymph node: they are –

1. Afferent lymph vessels: convey lymph toward the L. node and penetrate the capsule at multiple sites.  

2. Efferent lymph vessels: convey lymph away from the lymph node and leave at the hilum. It is one in number.

 Functions of lymph node:

1. Filter the lymph
2. 2.Produce lymphocytes
3. 3. Initiation of immune responses
4. 4.phagocytosis

Histological features of Lymph node:

1. capsule is present
2. sub-capsular sinus is present
3. Outer cortex contains lymphatic nodules. Superficial part of cortex contain B lymphocytes and deeper zone of cortex contain T lymphocyte
4. inner medulla  contain medullary cord which composed of B lymphocyte and plasma cells  

Cells present within the lymph nodes:

1.T & B lymphocyte,

2.dendritic cells,

3.macrophages

What is lymphatic nodule?

Ans: small collection of lymphocytes found in mucosa of different organs like ileum, appendix, bronchus etc.

Types of lymphatic nodule:

Primary and secondary lymphatic nodules

When a germinal center appears in a lymphatic nodule the lymphatic nodule known as secondary L nodule

What is germinal center:

It is a pale staining area situated within a lymphatic nodule contain immature B lymphoblast.

Germinal centre found only in secondary lymphatic nodule.

What is trabeculea?

Ans: They are the part of capsule which enter in to the organ

What do you mean by sinuses of lymph node?

Ans: these are empty spaces within a lymph node where lymph flows.