part_of adult neurohaemal organ adult lateral segmental organs Fig. 14-1, Fig. 14-16, in Biology of Ticks ISBN:0-19-505910-7. LSO Small cell clusters located in the lateral nerve plexus on the lateral sides of the synganglion. The cells of the LSO exhibitultrastructural characteristics consistent with steroid hormone secreting tissues. The LSO may be associated with hormonal functions. Previously thought to be site for ecdysteroid biosynthesis and secretion, that is now known to be carried out in the epidermisfollowing stimulation by the synganglion (Lomas et al. 1997). TADS:0000247 TADS:0000247 default_namespace adult lateral nerve plexus portion of tissue