endothelium

A layer of epithelium that lines the heart, blood vessels (endothelium, vascular), lymph vessels (endothelium, lymphatic), and the serous cavities of the body[MESH]. Simple squamous epithelium which lines blood and lymphatic vessels and the heart[FMA]. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the endothelium is

A layer of epithelium that lines the heart, blood vessels (endothelium, vascular), lymph vessels (endothelium, lymphatic), and the serous cavities of the body[MESH]. Simple squamous epithelium which lines blood and lymphatic vessels and the heart[FMA]. The atlas records it as a tissue at the tissue scale in the human body.

Where the endothelium is

This dataset records no region or system for it. No positional evidence of any kind. Drawn outside the body so it can still be found and counted, never inside it.

What the endothelium connects to

The atlas records 14 typed relationships for it, across 4 kinds of connection. part of tunica intima.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the endothelium. 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.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0001986, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: tunica intima.
• A kind of: meso-epithelium and simple squamous epithelium.
• subtype: blood vessel endothelium, corneal endothelium, endocardial endothelium, endothelium of arteriole, endothelium of artery and endothelium of capillary, and 4 more.
• Develops from: mesoderm.

Questions

Where is the endothelium?

This dataset records no region or system for it. No positional evidence of any kind. Drawn outside the body so it can still be found and counted, never inside it.

What does the endothelium connect to?

Part of: tunica intima.

Is the endothelium 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.