What Cells Are in Red Pulp

The red pulp is mainly filled with venous sinuses, which contain red blood cells and occasionally white blood cells. The sinuses are lined by elongated, rod-shaped endothelial cells. In a sinus seen in cross-section the endothelial cells would extend out of the screen.

What cells are found in red pulp?

Unlike white pulp, which mainly contains lymphocytes such as T cells, red pulp is made up of several different types of blood cells, including platelets, granulocytes, red blood cells, and plasma. The red pulp also acts as a large reservoir for monocytes.

Are B cells in red pulp?

IgM(+), IgD(++), and “switched” B cells are also closely associated with red pulp arterioles characterized by the expression of smooth muscle actin in muscle cells and in branched periarteriolar stromal cells.