Lymphatic System (Immune System)

These flashcards cover key vocabulary and concepts related to the lymphatic system and its role in immunity, as discussed in the lecture.

Lymphatic System

A network involved in immune responses and fluid balance, consisting of lymph, lymph nodes, and lymphatic vessels.

Antigens

Foreign bodies such as bacteria, viruses, and toxins that trigger an immune response.

Immunocompetent Cells

Cells that can recognize and respond to antigens; includes T-lymphocytes, B-lymphocytes, and macrophages.

T-Lymphocytes

A type of white blood cell that plays a central role in cell-mediated immunity.

B-Lymphocytes

A type of white blood cell that produces antibodies in response to antigens.

Macrophage

A type of immune cell that engulfs and digests cellular debris and pathogens.

Primary Lymphatic Nodule

Aggregated small lymphocytes that appear dark due to heterochromatic nuclei.

Secondary Lymphatic Nodule

A lymphatic nodule with a dark periphery and a central light germinal center containing lymphoblasts.

Tonsils

Aggregated lymphatic nodules in the pharynx that produce lymphocytes and antibodies.

Peyer's Patches

Aggregated lymphatic nodules located in the ileum, involved in immune response.

Lymph Node

An oval encapsulated lymphoid organ responsible for filtering lymph and producing immune responses.

Spleen

An organ that filters blood, produces antibodies, and supports lymphocyte production.

Red Pulp

The part of the spleen that consists of blood-filled sinuses and splenic cords, involved in filtering blood.

White Pulp

The lymphatic tissue in the spleen associated with the immune response, includes lymphatic nodules and perifollicular sheaths.

Hemal Nodes

Small lymphoid organs along blood vessels in ruminants, potential accessory organs for blood filtration.

Thymus

A bilobed organ where T-lymphocytes mature, consisting of a cortex and medulla.

Hassal's Corpuscles

Structures in the thymus medulla formed from dead reticulo-epithelial cells, involved in T-cell differentiation.