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LifeMap Discovery

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All Anatomical Compartments > Compartment Card
Heart >

Primitive Heart Tube

The primitive heart tube is formed by the splanchnic layer, which is comprised solely of first heart field cells. The short distance between the head fold and the forming foregut cause the heart to form two bulges at its midline (five-somite stage) and later fuse to form one bulge (six somite stage), which appears as a “linear” tube that immediately beings to loop (seven somite stage), to form a looped heart at E8.5 (nine-somite stage) which beats.

Linear or Initial Heart Tube Cells
Primitive Heart Tube
Multiple Ancestors Single Ancestor No Descendants Develops from Part of Parent