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Lymph is present throughout the body, and circulates through lymphatic vessels. These drain into and from lymph nodes â afferent vessels drain into nodes, and efferent vessels from nodes. When lymph fluid enters a node, it drains into the node just beneath the capsule in a space called the subcapsular sinus. The subcapsular sinus drains into trabecular sinuses and finally into medullary sinuses.
Lymph nodes are small glands that filter lymph, the clear fluid that circulates through the lymphatic system. They become swollen in response to infection and tumors. Lymphatic fluid circulates through the lymphatic system, which is made of channels throughout your body that are similar to blood vessels.