Spina vestibuli

Spina vestibuli
Interior of dorsal half of heart from a human embryo of about thirty days. (Spina vestibuli labeled at center left.)
*Anatomical terminology* [edit on Wikidata]

Below the opening of the orifice of the coronary sinus they fuse to form a triangular thickening—the spina vestibuli.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

Human embryogenesis in the first three weeks

Week 1

Week 2
(Bilaminar)

Germ layers	Archenteron/Primitive streak Primitive pit Primitive knot/Blastopore Primitive groove Gastrula Gastrulation Regional specification Embryonic disc

Ectoderm	Surface ectoderm Neuroectoderm Somatopleuric mesenchyme Neurulation Neural crest

Endoderm	Splanchnopleuric mesenchyme

Mesoderm	Axial mesoderm Paraxial Somite Somitomere Intermediate Lateral plate Intraembryonic coelom Splanchnopleuric mesenchyme Somatopleuric mesenchyme

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