File:Congdon1922-17.jpg

Fig. 17. Development of the pulmonary artery and ductus arteriosus

Showing degeneration of distal part of right arch and the incorporation of its proximal part into right branch of pulmonary artery; also approach of right and left branches through wall of pulmonary stem

a, 7-mm. embryo, No. 617

b, 11-mm. embryo, No. 1121

c, 13-mm. embryo, No. 1771

d, 18-mm. embryo, No. 1390

e, 43-mm. embryo, No. 886

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