The spleen is located in the upper left of the abdominal cavity, which is oblate, dark red, soft and brittle, and it is easy to rupture and bleed when it is hit locally by violence. The spleen is located between the gastric fundus and diaphragm in the left costal region, just opposite to the 9th-11rib, and its long axis coincides with the 9th-1rib.
The pancreatic duct is located in the pancreatic parenchyma, which runs in line with the long axis of the pancreas, from the tail of the pancreas to the head of the pancreas, receiving many interlobular ducts along the way, and finally merging with the common bile duct in the wall of the descending part of the duodenum to form the ampulla of the hepatopancreas, which opens in major duodenal papilla.
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Extended data
The essence of spleen is divided into three parts: white pulp, red pulp and marginal zone. White pulp is composed of dense lymphocytes, which is the main place where specific immunity occurs.
When the antigen invades the spleen and causes humoral immune response, the lymphoid nodules in white pulp will increase greatly. The red pulp is mainly composed of splenic sinus and splenic cord, and the slow blood flow in the red pulp makes it possible for antigen to fully contact phagocytes, which is the main place for phagocytosis of immune cells.
Marginal zone (MZ) is located at the junction of red pulp and white pulp. Lymphocytes in this zone are rarer than those in white pulp, mainly B cells, but there are more macrophages (Mφ), which is an important part of spleen to capture antigen, recognize antigen and induce immune response.
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