DEVELOPMENT OF THE PULMONARY VEINS

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Abstract
The examination of serial sections of human embryos between 24 and 34 days (3 to 11 mm) and the use of plastic reconstructions, showed that the common pulmonary vein develops as an outgrowth from the medial superior wall of the left auricle and unites with the angioblastic plexus of the developing lung bud. No evidence was found that the vein connects directly with the sinus venosus in the early stages, and later shifts in position as the atrial septum grows. Anomalous pulmonary venous drainage is classified in four main types, and theories of development are briefly discussed.

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