![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Pulmonary vein
The pulmonary vein does not accompany the respiratory passageways but travels alone through lung tissue. It will join the secondary bronchi and pulmonary artery near the root of the lung. 200x
![Pulmonary vein <p>The pulmonary vein does not accompany the respiratory passageways but travels alone through lung tissue. It will join the secondary bronchi and pulmonary artery near the root of the lung. 200x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.B.PV_.02.P01.png)
Pulmonary vein
The pulmonary vein does not accompany the respiratory passageways but travels alone through lung tissue. It will join the secondary bronchi and pulmonary artery near the root of the lung. 200x
![Alveoli <p>The pulmonary vein does not accompany the respiratory passageways but travels alone through lung tissue. It will join the secondary bronchi and pulmonary artery near the root of the lung. 200x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.B.PV_.02.P02.png)
Alveoli
The pulmonary vein does not accompany the respiratory passageways but travels alone through lung tissue. It will join the secondary bronchi and pulmonary artery near the root of the lung. 200x
![Alveolar duct <p>The pulmonary vein does not accompany the respiratory passageways but travels alone through lung tissue. It will join the secondary bronchi and pulmonary artery near the root of the lung. 200x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.B.PV_.02.P03.png)
Alveolar duct
The pulmonary vein does not accompany the respiratory passageways but travels alone through lung tissue. It will join the secondary bronchi and pulmonary artery near the root of the lung. 200x
![Alveolar sac <p>The pulmonary vein does not accompany the respiratory passageways but travels alone through lung tissue. It will join the secondary bronchi and pulmonary artery near the root of the lung. 200x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.B.PV_.02.P04.png)
Alveolar sac
The pulmonary vein does not accompany the respiratory passageways but travels alone through lung tissue. It will join the secondary bronchi and pulmonary artery near the root of the lung. 200x