"Success of silk processing depends on quality of silkcocoons, which form integral part of raw silk production and sericulture...Silk is produced and secreted from the external secreting gland (exocrine gland). It is derived from the ecoderm and appears at about 36 hours prior to the rotation (blaktokinesis)...Silk gland can be distinctly divided into three divisions, anterior, middle and posterior....its composition includes spinneret, anteriror division, middle division, and posterior division."