Understanding the Anatomy and Function of Lymph Nodes

4. The Lymph Node Capsule

Dense irregular connective tissue and plain collagenous fibers compose the lymph node capsule. Connective tissues called trabeculae slightly divide areas in the nodes into compartments. Eventually, the trabeculae meld into the tissue that connects the node with the lymphatic vessels. This creates a framework for the node, as well as a careful arrangement of connective tissue that forms the subcapsular sinus, also known as the lymph sinus or marginal sinus.