Pulp (spleen)

The pulp of the spleen is practically all splenic tissue from one trabecular artery to another. It consists of red pulp and white pulp.

Organs of the lymphatic system

Primary organs

Bone marrow	Hematopoietic stem cell

Thymus	Cortex Medulla Hassall's corpuscles

Secondary organs

Spleen	structural: Hilum Trabeculae Diaphragmatic surface of spleen Visceral surface of spleen Red pulp Cords of Billroth Marginal zone White pulp Periarteriolar lymphoid sheaths Germinal center blood flow: Trabecular arteries Trabecular veins

Tonsils	Palatine Lingual Pharyngeal Tubal Tonsillar crypts Waldeyer's tonsillar ring

Lymph nodes	lymph flow: Afferent lymph vessels Cortical sinuses Medullary sinuses Efferent lymph vessels T cells: High endothelial venules B cells: Primary follicle/Germinal center Mantle zone Marginal zone layers: Capsule/Trabeculae Subcapsular sinus Cortex Paracortex Medulla (Medullary cord) Hilum

MALT	GALT Peyer's patch Germinal center

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