Spleen white pulp vs Spleen red pulp
How to tell Spleen white pulp and Spleen red pulp apart when a board question makes them look alike.
White pulp: lymphoid immune tissue around central arterioles; red pulp: filtration tissue that clears aged and opsonized cells.
Side by side
White pulp surrounds central arterioles with lymphoid tissue and mounts immune responses to blood-borne antigens.
Red pulp contains splenic cords and sinusoids that remove old red cells and platelets and filter blood.
White pulp surrounds central arterioles with lymphoid tissue and mounts immune responses to blood-borne antigens.
Red pulp contains splenic cords and sinusoids that remove old red cells and platelets and filter blood.
The trap
Both compartments of the spleen, but they have very different functions. After splenectomy or in functional asplenia (sickle cell, post-radiation, autoimmune), patients lose both compartments: loss of red pulp removes the only site for clearing encapsulated bacteria opsonized by complement (Streptococcus pneumoniae, H influenzae, N meningitidis are the high-yield concern give vaccines and consider prophylactic penicillin in children); peripheral smear shows Howell-Jolly bodies (DNA remnants normally pitted by splenic macrophages) plus target cells, acanthocytes, and nucleated RBCs.
The repair move
Before naming the answer, force the stem through the separator: White pulp is immune lymphoid tissue; red pulp filters blood and removes aged RBCs.
Try a free question
CoreA histology slide of the spleen shows lymphoid tissue arranged around central arterioles with periarteriolar lymphoid sheaths (PALS) of T cells and adjacent B-cell follicles with germinal centers. Which region of the spleen is this?
Show answer and explanation
Answer: A. White pulp. Spleen WHITE PULP is the immune component organized around central arterioles. PALS (periarteriolar lymphoid sheaths) contain T cells; adjacent B-cell follicles contain germinal centers; the marginal zone surrounds the white pulp and contains specialized marginal zone B cells (important for response to encapsulated bacteria). The spleen mounts adaptive immune responses to blood-borne antigens.
Why the other choices are tempting
- B. Red pulp is the filtration component with cords of Billroth, venous sinusoids, and RBC turnover; not arranged around central arterioles.
- C. Marginal zone is at the boundary between white and red pulp, not the full white pulp.
- D. Hilum is the entry/exit of vessels and nerves.
- E. Capsule surrounds the spleen with connective tissue.
Flashcards
Tap a card to flip it.
What clue supports Spleen white pulp?
Choose Spleen white pulp when the stem gives this pattern: White pulp surrounds central arterioles with lymphoid tissue and mounts immune responses to blood-borne antigens.
What clue supports Spleen red pulp?
Choose Spleen red pulp when the stem gives this contrasting pattern: Red pulp contains splenic cords and sinusoids that remove old red cells and platelets and filter blood.
Quick answers
What is the fastest way to tell Spleen white pulp from Spleen red pulp?
White pulp: lymphoid immune tissue around central arterioles; red pulp: filtration tissue that clears aged and opsonized cells.
What is the key clue for Spleen white pulp?
White pulp surrounds central arterioles with lymphoid tissue and mounts immune responses to blood-borne antigens.
What is the key clue for Spleen red pulp?
Red pulp contains splenic cords and sinusoids that remove old red cells and platelets and filter blood.
What is the common trap with Spleen white pulp vs Spleen red pulp?
Both compartments of the spleen, but they have very different functions. After splenectomy or in functional asplenia (sickle cell, post-radiation, autoimmune), patients lose both compartments: loss of red pulp removes the only site for clearing encapsulated bacteria opsonized by complement (Streptococcus pneumoniae, H influenzae, N meningitidis are the high-yield concern give vaccines and consider prophylactic penicillin in children); peripheral smear shows Howell-Jolly bodies (DNA remnants normally pitted by splenic macrophages) plus target cells, acanthocytes, and nucleated RBCs.