SANGDON, yak qismi vaseshudai noi hoziin parrandahost. Sangdon az qismhoi gadudi va mushaki iborat ast. Kutikulai qismi mushakii aksari parrandaho gurri hosil mekunad, ki on yakjoya bo sangchahoe, ki parranda bo hamrohii khurok furu mebarad, ba mayda shudani khurok kumak merasonad.
Devorai qismi mushakii Sangdoni parrandahoi gushtkhur tunuk va parrandahoi donu hasharotkhur gafs me- boshad; dar parrandahoi mohikhur (parrandahoe, ki mohiro butun fu- ru mebarand) qismi mushakii Sangdon khele khurd buda, qismi gadudii on boshad, ba khaltai vase shabohat dorad.