Three-Dimensional Structure and Disposition of the Air Conducting and Gas Exchange Conduits of the Avian Lung: The Domestic Duck (Cairina moschata)
Figure 7
Micrographs showing the structure of the parabronchial parenchyma ((a) and (b)) and the ultrastructural details of the air capillaries (c and d). (a) Adjacent parabronchi are separated by a thin interparabronchial septum (asterisk). Large blood vessels (V) in the vicinity of the septum bulge into the parenchyma. (b) The only blood vessel that traverses the parabronchial mantle is the intraparabronchial vein (IPV) shown here. Notice (*) outside the interparabronchial septum (*) and air capillaries (AC) infundibulae (If) and atria (At). (c) The mantle consists of shallow atria (At) leading to elongated infundibulae (IF) and globular air capillaries (AC). (d) TEM micrograph showing an exchange capillary BC with a thin blood-gas barrier (rectangle) separating air capillaries (AC) from the lumen of the blood capillary.
