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.)
External links
- s_10/12732990 at Dorland's Medical Dictionary
- Histology at BU 07703loa
- Histology at OU 62_06
- Diagram at okstate.edu
- Diagram
Immune system: Lymphatic system (Lymph, Lymphocytes) | |
|---|---|
| Primary | Bone marrow – Thymus (Hassall's corpuscles) |
| Secondary: Spleen (process blood) | Hilum – Trabeculae
Red pulp (Cords of Billroth, Marginal zone) White pulp (Periarteriolar lymphoid sheaths, Germinal center) Trabecular arteries – Trabecular veins |
| Secondary: Lymph nodes (process extracellular fluid) | 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 Lymph node capsule - Subcapsular sinus - Cortex - Paracortex - Medulla (Medullary cord) - Hilus Lymph node trabeculae |
| Secondary: MALT (process mucosa) | GALT – Peyer's patches – Germinal center |
