What does Paracortical mean?

What does Paracortical mean?

Filters. The portion of a lymph node immediately surrounding the medulla. Unlike the cortex, which has mostly immature T cells, or thymocytes, the paracortex has a mixture of immature and mature T cells.

What is Paracortex in lymph node?

The paracortex of the lymph node is a T-cell zone. One feature of this region is the high endothelial venule, where circulating lymphocytes leave the bloodstream to enter the node. These postcapillary HEVs can be distinguished by their cuboidal endothelial cells.

What is Trabeculae of lymph node?

[TA] supporting bundles of connective tissue traversing the substance of the spleen, derived from the capsule of the spleen.

What is reactive lymphoid hyperplasia in lymph node?

Reactive lymphoid hyperplasia (RLH) has been described as the benign and reversible enlargement of lymphoid tissue secondary to antigen stimulus. 1. There are four patterns which can be seen in RLH: Follicular Pattern, Diffuse Paracortical Hyperplasia, Sinus Histiocytosis and Mixed Pattern.

What is Paracortical expansion?

Paracortical hyperplasia is the preferential stimulation of the T cell compartment. It is caused by an abnormal expansion of the interfollicular zones but is confined within the lymph node capsule. The population of the compartment is cytologically polymorphous.

Where is Paracortex in lymph node?

The cortex of a lymph node is the outer portion of the node, underneath the capsule and the subcapsular sinus. It has an outer part and a deeper part known as the paracortex. The outer cortex consists of groups of mainly inactivated B cells called follicles.

What is the main purpose of lymph?

The lymphatic system is a network of tissues and organs that help rid the body of toxins, waste and other unwanted materials. The primary function of the lymphatic system is to transport lymph, a fluid containing infection-fighting white blood cells, throughout the body.

What’s the difference between lymph nodes and glands?

The term “swollen glands” usually refers to enlarged lymph nodes. In fact, lymph nodes are not actually glands. They are small bundles of white blood cells that are present in multiple areas throughout our body.

What is the difference between lymph nodes and lymph nodules?

The nodule differs from a lymph node in that it is much smaller and does not have a well-defined connective-tissue capsule as a boundary. Lymph nodules frequently contain germinal centres—sites for localized production of lymphocytes. In the small intestine, collections of lymph nodules are called Peyer’s patches.

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