Pneumatization.
D000388:Air; D000818:Animals; D002645:Chickens; D003095:Collagen Diseases / Q000209:etiology; D006811:Humerus / Q000098:blood supply / Q000000981:diagnostic imaging / Q000473:pathology*; D010010:Osteoclasts / Q000503:physiopathology; D011859:Radiography; D014652:Vascular Diseases / Q000209:etiology