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Fig. 1
The pattern of 5-HT-IR neurons and fibres in head region of I pseudospiralis. a – Three pairs of neurons (large and small arrows) with nerve fibres extending in anterior and posterior direction. Note 5-HT-IR in the tip of the head (small arrow). Bar = 30 μm. Inset. Magnification of the tip of the head with 5-HT-IR structures (arrows); b-Bar= 10 μm; c- Magnification of the three pairs of neurons (large and small arrows). Bar =25 μm; d- The pattern of 5-HT nerve cords (arrows). Bar = 20 μm; e – Magnification of the longitudinal nerve cord connected by transverse commissures (arrow). Bar =10 μm
Fig. 2
5-HT-IR nerve cells and fibres forming a plexus near of vulva in I pseudospiralis (the nerve trunks are noted by arrows also). a-Bar =20 μm; b-Large magnification of the 5-HT-IR nerve cells and fibres near of vulva Bar =10 μm
Fig. 3
5-HT-IR nerve cells in the tail of male of T. pseudospiralis. Bar =10 μm
Fig. 4
a, b – 5-HT-IR structures representing sublateral rows of hypodermal glands along the body of T. pseudospiralis. Bar =20 μm