Lymphatic System 4e Notes Fall 2022

Lymphatic System

A network of vessels and nodes that return excess interstitial fluid to the circulatory system and is involved in immune functions.

Primary lymphoid structures

Organs where lymphocytes are produced and mature, such as red bone marrow and the thymus.

Secondary lymphoid structures

Organs that populate lymphocytes and other immune cells, including lymph nodes and the spleen.

Lymph

Interstitial fluid that has entered lymphatic vessels.

Lymphatic vessels

Vessels that transport lymph from tissues to the circulatory system.

Lymphatic capillaries

Smallest lymph vessels; found among blood capillary beds and allow absorption of interstitial fluid.

Thymus

A primary lymphoid structure that is the site of T-lymphocyte maturation.

MALT (mucosa-associated lymphoid tissue)

A type of secondary lymphoid structure found in the walls of mucosal organs.

Spleen

The largest lymphoid organ that filters blood and removes aged erythrocytes.

Lymph nodes

Small structures that filter lymph and produce immune responses; may be superficial or deep.

Afferent lymphatic vessels

Vessels that carry lymph into a lymph node.

Efferent lymphatic vessels

Vessels that carry lymph away from a lymph node.

Cancer metastasis

The spread of cancer cells to other parts of the body, often involving lymphatic and blood circulation.

Swollen glands

Common term for enlarged lymph nodes, often due to infection or other immune responses.

Palatine tonsils

The tonsils located at the sides of the throat, part of the immune system.

Pharyngeal tonsil

Also known as adenoids, located at the back of the nasal cavity.

Lingual tonsil

The tonsils located at the back of the tongue.