The tubular heart or primitive heart tube is the earliest stage of
heart
The heart is a muscular Organ (biology), organ in most animals. This organ pumps blood through the blood vessels of the circulatory system. The pumped blood carries oxygen and nutrients to the body, while carrying metabolic waste such as ca ...
development.
From the inflow to the outflow, it consists of
sinus venosus
The sinus venosus is a large quadrangular cavity which precedes the atrium on the venous side of the chordate heart. In mammals, it exists distinctly only in the embryonic heart, where it is found between the two venae cavae. However, the sinus v ...
,
primitive atrium
The primitive atrium is a stage in the embryonic development of the human heart. It grows rapidly and partially encircles the bulbus cordis; the groove against which the bulbus cordis lies is the first indication of a division into right and left ...
, the
primitive ventricle, the
bulbus cordis, and
truncus arteriosus
The truncus arteriosus is a structure that is present during embryonic development. It is an arterial trunk that originates from both ventricles of the heart that later divides into the aorta and the pulmonary trunk.
Structure
The truncus arterio ...
.
It forms primarily from
splanchnic mesoderm. More specifically, they form from
endocardial tubes, starting at day 21.
References
External links
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Embryology of cardiovascular system
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