Laryngotrachea

Fragmentation or separation of the bolus results in scattered particles and increased risk of misentry into the nasopharynx or laryngotrachea.

The laryngotracheas were cleansed and each cricothyroid muscle was isolated with blunt dissection.

[T]he other method is a synthesis method, which mostly takes animal laryngotracheae, cartilages and the like as raw materials, extracts chondroitin sulfate by enzymolysis, and then takes the chondroitin sulfate as the raw material for preparation, […]