Note 121 — THE RESPIRATORY SYSTEM
Reading edition
The septal cartilage is to be regarded as an unossified part of the mesethmoid. It will be noted that the line of demarcation between the bone and the cartilage is irregular and varies with age; extensive ossification for calcification) of the cartilage is commonly found in old animals. The process often results in the formation of calcareous islands in the cartilage.