Silk glands
The three layers of silk glands such astunica propria, glandular layer and tunica intima were visible in normal silkworm. The secretory cells have rich secretory granules with a wider layer compared to tunica propria. Tunica propria is narrow and the lumen consists of silk mass. Glandular zone has a large number of haemocytes, whose nuclei are branched. (Fig. 2 a). In disease infected worm, the silk gland shows loss of tunica propria integrity and secretory layer is not easily distinguishable from tunica propria. Lumen is seen distorted with vacuolation in the silk mass. The silk mass loss compactness and becomes less dense (Fig. 2b).