part_of adult female reproductive system adult lobular accessory gland Fig. 16 -1, Fig. 16-2, Fig. 16-19, Fig. 16-20, Fig. 16-21, in Biology of Ticks ISBN:0-19-505910-7. LAG TADS:0000457 TADS:0000457 The lobular accessory gland (LAG) is found only in ixodid ticks. The LAG surrounds the vestibular vagina, separated from it by a vestibular sinus (VS). The LAG consists of a bulblous three-lobed gland about 150 microns thick surrounding the vestibular vagina. Numerous ducts permeate the lobes of the gland and fuse with the VS. The secretory cells of the LAG are filled with lipids. Although the function of the LAG is unknown, it is believed to produce a lipid rich secretion that coats the eggs as they pass through the vestibular vagina during oviposition. default_namespace female organism portion of tissue