Larger vessels are similar to veins

Larger lymphatic vessels are similar to veins.

Lymph vessels are the vessels which are structurally similar to the blood vessels. They filter and carry the lymph back from the tissues into the circulatory system unidirectionally.

One of the characteristic feature of the lymphatic vessels that make them resemble the veins is the presence of the valves in them. The presence of the valves prevent the blackflow of the lymph. The other similarity between the lymph vessels and the veins is the layers present in them. Similar to a vein, a lymph vessel is also made up of an outer layer called the tunica adventitia or the tunica externa, a middle layer called the tunica media and an inner layer called the tunica intima.

Thus, the presence of the three layers and the valves make the larger lymphatic vessels resemble the veins.