Lymph nodes are busy meeting places for your immune cells. Fibroblastic reticular cells build the roads they travel on.
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You have hundreds of small, bean-shaped lymph nodes. Some are in your neck, armpits, and belly.
Inside each one are fibroblastic reticular cells. They are star-shaped, with long, thin arms that link up into a big net.
When you have a cold, the lymph nodes in your neck can get a little bigger and sore. That means your immune cells are busy working inside them.
Immune cells called T cells crawl through the lymph node looking for signs of germs. They need a path to follow.
Some of the fibers are hollow, like tiny pipes. Small bits from the body can travel through them deep into the lymph node.