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. 2021 Apr 6;299(3):508–523. doi: 10.1148/radiol.2021203711

Figure 3d:

Anatomic basis for understanding pulmonary functional physiologic structure. (a) Magnified view of alveolar ducts and alveoli with orifices in a healthy patient. Alveoli are polygonal in shape and have orifices into alveolar ductal spaces. (b) Histologic sample of the healthy lung with hematoxylin-eosin stain. The divergence from terminal to respiratory bronchioles is shown. (c, d) A radiograph of 1-mm-thick specimen demonstrates the secondary lobules. The pulmonary arteries are located in the center, and pulmonary veins are located in the periphery of the secondary pulmonary lobule. The terminal and respiratory bronchioles are observed as tubular structures accompanying the pulmonary arteries. The primary lobules are indicated as yellow dashed circles in d. (Parts a–d adapted, with permission, from reference 10.) (e) Diagram shows anatomy and dimensions of secondary lobule and pulmonary acinus. Two secondary pulmonary lobules in the lung periphery are illustrated, with approximate dimensions of their components indicated. (Reprinted, with permission, from reference 12.)

Anatomic basis for understanding pulmonary functional physiologic structure. (a) Magnified view of alveolar ducts and alveoli with orifices in a healthy patient. Alveoli are polygonal in shape and have orifices into alveolar ductal spaces. (b) Histologic sample of the healthy lung with hematoxylin-eosin stain. The divergence from terminal to respiratory bronchioles is shown. (c, d) A radiograph of 1-mm-thick specimen demonstrates the secondary lobules. The pulmonary arteries are located in the center, and pulmonary veins are located in the periphery of the secondary pulmonary lobule. The terminal and respiratory bronchioles are observed as tubular structures accompanying the pulmonary arteries. The primary lobules are indicated as yellow dashed circles in d. (Parts a–d adapted, with permission, from reference 10.) (e) Diagram shows anatomy and dimensions of secondary lobule and pulmonary acinus. Two secondary pulmonary lobules in the lung periphery are illustrated, with approximate dimensions of their components indicated. (Reprinted, with permission, from reference 12.)