The trabecular veins are the largest veins inside the
spleen
The spleen is an organ found in almost all vertebrates. Similar in structure to a large lymph node, it acts primarily as a blood filter. The word spleen comes . . It drains the blood collected in the sinuses of the pulp.
Details
The blood is collected from the interstices of the tissue by the rootlets of the
veins
Veins are blood vessels in humans and most other animals that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated b ...
, which begin much in the same way as the
arteries
An artery (plural arteries) () is a blood vessel in humans and most animals that takes blood away from the heart to one or more parts of the body (tissues, lungs, brain etc.). Most arteries carry oxygenated blood; the two exceptions are the pu ...
end.
The
connective-tissue corpuscles of the pulp arrange themselves in rows, in such a way as to form an elongated space or sinus.
They become elongated and spindle-shaped, and overlap each other at their extremities, and thus form a sort of
endothelial
The endothelium is a single layer of squamous endothelial cells that line the interior surface of blood vessels and lymphatic vessels. The endothelium forms an interface between circulating blood or lymph in the lumen and the rest of the vessel ...
lining of the path or sinus, which is the radicle of a vein.
On the outer surfaces of these cells are seen delicate transverse lines or markings, which are due to minute elastic fibrillæ arranged in a circular manner around the sinus.
Thus the channel obtains an external investment, and gradually becomes converted into a small vein, which after a short course acquires a coat of ordinary connective tissue, lined by a layer of flattened epithelial cells which are continuous with the supporting cells of the pulp.
The smaller veins unite to form larger ones; these do not accompany the arteries, but soon enter the trabecular sheaths of the capsule, and by their junction form six or more branches, which emerge from the
hilum, and, uniting, constitute the
lienal vein
The spleen is an organ found in almost all vertebrates. Similar in structure to a large lymph node, it acts primarily as a blood filter. The word spleen comes . , the largest radicle of the
portal vein.
References
External links
* - "Lymphoid Tissues and Organs: spleen, central artery and trabecular vein"
Slide at udel.edu* (See figure #16)
Veins
Spleen (anatomy)
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