Lymphoid Tissue Histology

Lymphoid Tissue Histology

Draw and describe any of the following: Spleen, lymph node, tonsil, thymus

Read And Learn More: Anatomy Notes And Important Question And Answers

Introduction: It is a member of lymphatic system. It consists of rounded follicles of lymphocytes. They are more in the periphery (cortex).

1. Types: There are two types of lymphocytes.

1. B lymphocytes are found in the follicles and medulla.
2. T lymphocytes are found in the paracortical areas and in the cortex between follicles.

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2. Characters

1. Covered by dense connective tissue called capsule which contains smooth muscle cells.

2. Afferent lymphatics enter into the subscapular space.

3. Consists of outer cortex and inner medulla.

1. The cortex is packed with lymphocytes.
2. The number of rounded lymphatic follicles is present.
3. Each nodule has a pale staining germinal centre surrounded by densely packed lymphocytes.
4. Within the medulla, the lymphocytes are arranged in the form of anastomosing cords.

Loose areolar tissue

Introduction: It is connective tissue made up of bundles of fibres which encloses large spaces called areola.

1. Structure

1. Made up of bundle of fibres.

2. Cells:

1. Fibroblast,
2. Macrophages,
3. Mast cells,
4. Lymphocytes,
5. Fat cells,
6. Pigment cells and
7. Plasma cells.

2. Abundant intercellular space.

3. Site

1. Superficial fascia
2. Ligamenta flava
3. Basement membrane.