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.)

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Lymphatic system
Bone marrow | Thymus (Hassall's corpuscles) | Spleen (White pulp, Periarteriolar lymphoid sheaths, Marginal zone, Red pulp) | Tonsils (Palatine, Lingual, Adenoid)

Mucosa-associated lymphoid tissue: Gut-associated lymphoid tissue | Peyer's patches

Lymph nodes: Subcapsular sinus | Paracortex | head and neck (Cervical, Virchow's) | iliac (External, Common, Internal) | lumbar/paraaortic (Lateral aortic, Preaortic, Inferior mesenteric, Retroaortic) | inguinal (Deep, Superficial) | Axillary

Lymph vessels: Thoracic duct | Right lymphatic duct | Cisterna chyli  | Lumbar trunk | Intestinal trunk

Lymph | Lymphocytes | High endothelial venules | Immune system
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