Lung development, illustration

Numéro d’image : 13386360
Lung development, illustration
Lung development, illustration. The lungs develop from around the fourth week of human embryonic development. The lungs become progressively more branched and able to exchange gases with the blood, with a full-term newborn baby able to breathe unaided. From left, the first three drawings show the embryonic stage (0-7 weeks). The next three drawings show the canalicular stage (16-25 weeks), with the last three showing the saccular stage (alveolar) from 25 weeks to full term. Over this period, the following structures develop: trachea (windpipe), the extrapulmonary space, the main bronchus, the bronchi (branches), the bronchioles, the terminal and respiratory bronchioles, the alveolar ducts, and the alveoli. By the time a baby is born, it will have developed 300 to 600 million alveoli (around 1000 per lung acinus or alveolar sac).
Licence : Droits gérés
Crédit: Science Photo Library / Lunau, Claus
Taille de l’image : 6087 px × 1654 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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