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. Author manuscript; available in PMC: 2013 Apr 19.
Published in final edited form as: Compr Physiol. 2012 Jan 1;2:675–709. doi: 10.1002/cphy.c100081

Figure 2.

Figure 2

The adventitial sheath of the bronchovascular bundle tethers to the adjacent airway or to alveolar septal networks. A section of human lung stained with hematoxylin and eosin (A) shows the adventitia of the pulmonary artery abutting the submucosa of the adjacent airway. Bronchial vessels (bv), the vasa vasorum of the pulmonary artery wall (v), and submucosal glands are visible. The section from rat lung (B) was probed using immunohistochemistry for the adhesion molecule ICAM-1, with hematoxylin counterstaining. In this micrograph, a portion of the arterial wall is seen to be tethered to surrounding alveolar septal walls. Adventitial borders are pinpointed with arrowheads.