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).