Trabeculae of spleen
Encyclopedia
The fibroelastic coat of the spleen
Spleen
The spleen is an organ found in virtually all vertebrate animals with important roles in regard to red blood cells and the immune system. In humans, it is located in the left upper quadrant of the abdomen. It removes old red blood cells and holds a reserve of blood in case of hemorrhagic shock...

 invests the organ, and at the hilum
Splenic hilum
The Splenic hilum is a location on the surface of the spleen.It is the point of attachment for the gastrosplenic ligament, and the point of insertion for the splenic artery and splenic vein.Structures that enter the hilum are:* Splenic artery...

 is reflected inward upon the vessels in the form of sheaths. From these sheaths, as well as from the inner surface of the fibroelastic coat, numerous small fibrous bands, the trabeculae of the spleen (or splenic trabeculae), emerge from all directions; these uniting, constitute the frame-work of the spleen.

The spleen therefore consists of a number of small spaces or areolae, formed by the trabeculæ; in these areolæ is contained the splenic pulp
Splenic pulp
The red pulp of the spleen is composed of connective tissue known as the cords of Billroth and many splenic sinuses that are engorged with blood, giving it a red color...

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