# mesocardium

> English word · Noun

## Definitions
1. The structure of splanchnic mesoderm that supports the embryonic heart in the pericardial cavity. In the adult, it refers to any one of two tube-like prolongations of the epicardium. One encloses the aorta and pulmonary trunk and the second all pulmonary veins.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/mesocardium