Periarteriolar lymphoid sheaths

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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

• s_10/12732990 at Dorland's Medical Dictionary
• Histology at BU 07703loa
• Histology at OU 62_06
• Diagram at okstate.edu
• Diagram

v • d • e Immune system: Lymphatic system (Lymph, Lymphocytes) Primary Bone marrow – Thymus (Hassall's corpuscles) Secondary: Spleen (blood) Hilum – Trabeculae Red pulp (Cords of Billroth, Marginal zone) White pulp (Periarteriolar lymphoid sheaths, Germinal center) Trabecular arteries – Trabecular veins Secondary: Lymph nodes (extracellular fluid) Subcapsular sinus – Paracortex – Lymph vessels – High endothelial venules – Germinal center Secondary: MALT (mucosa) GALT – Peyer's patches – Germinal center