The Spleen is a rather simple Organ of the body.

It is virtually found in all vertebrates.

Although bone marrow is typically the site of red blood cell formation.

During gestation up until the 5th month, the spleen is the primary site of red blood cell formation.

After birth the spleen can still produce lymphocytes which help fight infection.



  • Its main function is dealing with red and white blood cells.
  • It can act as a storage and helps in the breakdown of old red blood cells and the Immune System.
  • It is gaining wider appreciation as a part of this system.
  • Without the spleen it has been noted an increased risk to certain infections.
  • Other Functions include preservation of RBC to prevent Hemorrhagic shock and recycles Iron.



  • It is located near the Pancreas and the Stomach and lies beneath the 9th to the 12th thoracic ribs.
  • It is on the left side of the abdomen.
  • It is brownish in color.
  • The spleen possesses only Efferent Lymphatic Vessels.
  • The spleen is part of the Lymphatic System
  • Both the gastric arteries and splenic artery supply it with blood.



Removal of Spleen

  • The spleen is not an essential organ.
  • Function may change minimally once removed.
  • Platelets and White Blood Cells may be mildly elevated afterwards.
  • Diminished response to immunization can be seen.
  • Increased risk for infection.



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