part of part of adjacent to adjacent to alveolus of lung septum interalveolar septum septum interalveolare BTO:0003149 EMAPA:35433 A the thin septum that separates adjacent pulmonary alveoli, containing connective tissue constituents of the respiratory tissue and the capillary network of the blood supply of the lung. NCIT:C49473 MA:0000421 alveolar septum UBERON:0004893 Wikipedia:Alveolar_septum UMLS:C1706784 alveolar system