环状软骨是气道支架中唯一完整的软骨环,通常认为它对气道管腔起着重要的支架作用,其弓部断裂会引起声门下区狭窄。然而过去对生长发育期家兔的形态学研究发现只要弓的内表层软组织不受损伤,声门下区的正常发育不会受影响。为了说明上皮下层组织在防止气道狭窄中的作用,作者进行了组织学研究。将新西兰种的雌性白兔分为7组。第1组为13只4周的幼兔,第2组为28只24周的成年兔, Cyclic cartilage is the only intact cartilage ring in airway stents. It is generally considered to play an important scaffolding role in the airway lumen. The fracture of the bow will cause stenosis in the subglottic area. In the past, however, morphological studies of rabbits in their growth and development found that as long as the inner soft tissue of the bow was not damaged, the normal development of the subglottic area was not affected. The authors performed histological studies in order to illustrate the role of the epithelium in preventing airway stenosis. New Zealand white female rabbits were divided into 7 groups. The first group was 13 4-week-old rabbits, the second group was 28 24-week-old adult rabbits,