endocardium

The endocardium is an anatomical structure comprised of an endothelium and an extracellular matrix that forms the innermost layer of tissue of the heart, and lines the heart chambers[GO]. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the endocardium is

The endocardium is an anatomical structure comprised of an endothelium and an extracellular matrix that forms the innermost layer of tissue of the heart, and lines the heart chambers[GO]. The atlas records it as a tissue at the tissue scale in the human body.

Where the endocardium is

It sits in the thorax and trunk, within the cardiovascular system. Positioned deliberately as part of this species body plan.

What the endocardium connects to

The atlas records 10 typed relationships for it, across 5 kinds of connection. part of heart.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the endocardium. 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 endocardial lining, endocardial tissue, heart endocardium and heart endocardial tissue. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0002165, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: heart.
• A kind of: anatomical structure, organ component layer and tunica intima.
• subtype: endocardium of atrium, endocardium of ventricle and interventricular septum endocardium.
• contains: endocardial endothelium and endocardial cushion.
• Develops from: primitive heart tube.

Questions

Where is the endocardium?

It sits in the thorax and trunk, within the cardiovascular system. Positioned deliberately as part of this species body plan.

What does the endocardium connect to?

Part of: heart.

Is the endocardium 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.