Spleen is an organ in abdominal cavity, which is connected with adjacent organs through gastrosplenic ligament, spleen-kidney ligament, diaphragm-spleen ligament and spleen-colon ligament. The spleen is not easy to see because it is behind the human body.
The spleen in the spleen meridian is not the spleen with a specific shape as mentioned by western medicine. Spleen meridian is one of the the twelve meridians in the study of meridians in traditional Chinese medicine, which can't be seen by naked eye microscope. The spleen meridian has a route with acupoints on it. The reason why it is called spleen meridian should be related to its related viscera (spleen and stomach collaterals) and the route of circulation.
Suggestion: