DExcFIG 3: Secretory-excretory junction in L2 and dauer larvae.

A. Cartoon showing the overall structure of the secretory-excretory junction in the head near the pharynx. The boxed region indicates the location of the secretory sinus and is the approximate region shown in panels B-E (below).
B&D. Transverse sections of the head region where the secretory sinus is located (boxed region) in an L2 (B) and dauer larva (D). The excretory pore is visible in the L2 section (B) and is slightly offset in the dauer section (D). Bars, 5 microns.
C&E. Close-up views of the boxed regions from B&D showing the secretory sinus and adjacent excretory gland cells. Dark-staining granules are present in the excretory gland cells of the L2 (C) but absent in the dauer (E). Bars, 1 micron. (Image sources: L2 [D. Riddle] L2 28-14 #1315; dauer [D. Riddle] 50-2-2 #1049.)

Click on picture for full resolution image.