Spina vestibuli
a m.esechymal condensation which extends from the mediastinum of the heart and covers the leading edge of the primary atrial septum
Spina vestibuli, or vestibular spine, is a bony structure, in anatomical terms a 'mesenchymal condensation', which extends from the mediastinum of the heart and covers the leading edge of the primary atrial septum; its origin is outside of the heart. Below the opening of the orifice of the coronary sinus they fuse to form a triangular thickening — the spina vestibuli. It is believed to play a formative role in atrial septation, which is how the common atrium of the heart divides into two during gestation. Its lack of development is thought to contribute to the morphogenesis of atrioventricular septal defect (AVSD) in Down syndrome.
This brief starts where responsible research should: with the source description of “Spina vestibuli” as a m.esechymal condensation which extends from the mediastinum of the heart and covers the leading edge of the primary atrial septum. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the general reference register because the source frames it as a m.esechymal condensation which extends from the mediastinum of the heart and covers the leading edge of the primary atrial septum. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Jul 18, 2025. The linked authority identifier is Q7577439. None of the 0 selected statements returned an explicit reference.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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Questions for further research
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This entry incorporates text from “Spina vestibuli” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.