lymphoid system

The lymphatic system in vertebrates is a network of conduits that carry a clear fluid called lymph. It also includes the lymphoid tissue through which the lymph travels. Lymphoid tissue is found in many organs, particularly the lymph nodes, and in the lymphoid follicles associated with the digestive system such as the tonsils. The system also includes all the structures dedicated to the circulation and production of lymphocytes, which includes the spleen, thymus, bone marrow and the lymphoid tissue associated with the digestive system[WP]. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the lymphoid system is

The lymphatic system in vertebrates is a network of conduits that carry a clear fluid called lymph. It also includes the lymphoid tissue through which the lymph travels. Lymphoid tissue is found in many organs, particularly the lymph nodes, and in the lymphoid follicles associated with the digestive system such as the tonsils. The system also includes all the structures dedicated to the circulation and production of lymphocytes, which includes the spleen, thymus, bone marrow and the lymphoid tissue associated with the digestive system[WP]. The atlas records it as a system at the system scale in the human body.

Where the lymphoid system is

It sits within the lymphatic & immune system. Only the system is known. The position shown carries almost no spatial information.

What the lymphoid system connects to

The atlas records 11 typed relationships for it, across 3 kinds of connection. part of hemolymphoid system and immune system.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the lymphoid system. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.

Also called

Also recorded as lymphatic system, lymphatic circulatory system, lymphatic drainage system and systema lymphoideum. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0002465, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: hemolymphoid system and immune system.
• A kind of: anatomical system.
• contains: lymph node, lymph node interfollicular cortex, lymph node paracortex, lymphatic part of lymphoid system, lymphoid tissue and non-lymphatic part of lymphoid system, and 2 more.

Questions

Where is the lymphoid system?

It sits within the lymphatic & immune system. Only the system is known. The position shown carries almost no spatial information.

What does the lymphoid system connect to?

Part of: hemolymphoid system and immune system.

Is the lymphoid system the same in other species?

Leumas holds the same relationship vocabulary for every species it carries, so where another dataset records this structure you can put the two side by side on /compare.