Periarteriolar lymphoid sheaths (or periarterial lymphatic sheaths, or PALS) are a portion of the white pulp of the spleen. They are populated largely by T cells.

(This is in contrast to the lymphoid portions of the white pulp, where B cells predominate.)

[edit] External links

• Histology at BU 07703loa
• Histology at OU 62_06
• Diagram at okstate.edu
• Diagram

v • d • e Immune system: Lymphatic system (Lymph, Lymphocytes, Lymph vessels) (TA A13.1-2, GA 8) Primary Bone marrow · Thymus (Hassall's corpuscles) Secondary Spleen (process blood) structural: Hilum · Trabeculae Red pulp (Cords of Billroth, Marginal zone) White pulp (Periarteriolar lymphoid sheaths, Germinal center) blood flow: Trabecular arteries · Trabecular veins Lymph nodes (process extracellular fluid) 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 (process mucosa) GALT · Peyer's patches · Germinal center lymphatic organ navs: anat, physio, lymphatic disease/splenic disease/thymus disorders/thymus neoplasia/vascular tumors, proc

This article related to the lymphatic system is a stub. You can help Wikipedia by expanding it. v • d • e