Spleen consists of red pulp and white pulp (black dash line). White pulp is rich in lymphocytes and a central artery displaced peripherally within white pulp. Red pulp contains venous sinus and splenic cord and  many red blood cells could be seen in red pulp.

Spleen consists of red pulp and white pulp which is rich in lymphocytes. Red pulp contains venous sinus (stars) and splenic cord and  many red blood cells could be seen in red pulp.

Splenic sinus (SS) in the red pulp is lined by long endothelial cell (EN) which extended cytoplasm (arrows) runs parallel to the direction of vessel.

In this photo, a red blood cell (RBC) passed through the intercellular space  of  splenic sinus (SS).

Splenic sinus (SS) in the red pulp  is lined by long endothelial cell which extended cytoplasm (arrows) runs parallel to the direction of vessel.

In this photo, a red blood cell (RBC) passed through the intercellular space  of  splenic sinus (SS).

In the red pulp, several blood cells could be observed. This photo shows an eosinophil (E) and several red blood cells (RBC).

The nucleus of eosinophil (E) is usually bilobed. The most prominent feature of eosinophil (E) in the cytoplasm is crystalline bodies (Cr) which are surrounded by a less electron-dense matrix.

White pulp is rich in lymphocytes (L) and a central artery is located peripherally within white pulp.

White pulp is rich in lymphocytes (L) and a central artery is located peripherally within white pulp.