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Heart development
Heart development refers to development of the human heart. This begins with the formation of two endocardial tubes which merge to form the tubular heart, also called the ''primitive heart tube'', that loops and septates into the four chambers and paired arterial trunks that form the adult, human heart. The heart is the first functional organ in vertebrate embryos, and in the human, beats spontaneously by week 4 of development.
The tubular heart quickly differentiates into the truncus arteriosus, bulbus cordis, primitive ventricle, primitive atrium, and the sinus venosus. The truncus arteriosus splits into the ascending aorta and pulmonary artery. The bulbus cordis forms part of the ventricles. The sinus venosus connects to the fetal circulation.
The heart tube elongates on the right side, looping and becoming the first visual sign of left-right asymmetry of the body. Septa form within the atria and ventricles to separate the left and right sides of the heart.
==Primitive development==
The heart derives from embryonic mesodermal germ-layer cells that differentiate after gastrulation into mesothelium, endothelium, and myocardium. Mesothelial pericardium forms the outer lining of the heart. The inner lining of the heart, lymphatic and blood vessels, develop from endothelium.
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