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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

• Dorlands/Elsevier s_10/12732990
• Histology at BU 07703loa
• Histology at OU 62_06
• Diagram at okstate.edu
• Diagram

v • d • e</span>  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: Cervical lymph nodes | Common iliac lymph nodes Deep inguinal lymph nodes | External iliac lymph nodes | Inferior mesenteric lymph nodes | Internal iliac lymph nodes | Lateral aortic lymph nodes | Paraaortic lymph node | Preaortic lymph nodes | Paratracheal chain | Retroaortic lymph nodes | Sentinel lymph node | Superficial inguinal lymph nodes | Virchow's node Lymph vessels: Thoracic duct | Right lymphatic duct | Cisterna chyli  | Lumbar trunk | Intestinal trunk Lymph | Lymphocytes | Immune system