Chapter 20

Formed by endothelium; smallest lymphatic vessels

Lymphatic capillaries

Red area of spleen that contains old RBCs and platelets

Red pulp

Form from lymphatic trunks; 2 trunks join the cardiovascular system at the junction of the jugular and subclavian veins

Lymphatic duct

Lymph formed in the intestines; typically white and cloudy due to absorbed fats

Chyle

Mucosal associated lymphatic tissue

MALT

Collections of lymphatic cells and connective tissue scattered throughout the body; no capsule present

Lymphatic tissues

Lymphatic follicles found in the intestinal wall

Peyer's patches

Chemical signals sent between cells in the immune system

Cytokines

Invaginations of the capsule in lymph nodes

Trabeculae

Lightly staining; contains macrophages and dendritic cells

Germinal center of lymphatic follicle

Fluid in the lymphatic system; typically clear and similar in composition to interstitial fluid

Lymph

Malignant cancer that develops in lymphatic structures, most often from abnormal B lymphocytes

Lymphoma

Drains lymph from the right side of the head and the right arm

Right lymphatic duct

Drains lymph from the left side of the head, left arm, trunk, and both legs

Left lymphatic (or thoracic) duct

Drain lymph from the lymph node

Efferent collecting vessel

Form from lymphatic capillaries; have three tunics

Collecting vessels

Bring lymph to the lymph node

Afferent collecting vessels

Partially encapsulated lymphatic organs; contain lymphatic follicles

Tonsils

Allow for the one way flow of lymph

Valves

Lymphatic capillaries in the intestine

Lacteals

Small circular regions of the thymus that are responsible for the release of cytokines that regulate WBC activity

Thymic corpuscles

Fat soluble vitamins that are transported by the lymphatic system

Vitamins D, E, A, and K

Largest lymph organ located in the L hypochondriac region

Spleen

Egg shaped mass of lymphatic cells

Lymphatic follicles

Swollen painful lymph nodes due to an infection

Bubos

Encapsulated lymphatic tissue associated with collecting vessels

Lymph nodes

Bilobed gland in the mediastinum; secretes hormones necessary for T cell maturation

Thymus

Purple stained area of spleen; contains lymphocytes

White pulp