Morphology of the neurohemal organs of a <i>D. radicum</i> larva, scanning electron microscopy.

<p>A) Dorsal view of the larval nervous system consisting of the two brain hemispheres (BR) and the ventral ganglion (VG, to the right) comprising the suboesophageal, thoracic and abdominal neuromeres. The ring gland (RG) is visible to the left, attached to the brain. The stars mark the abdominal PSOs. B) Enlarged picture of the ventral ganglion. Four abdominal PSOs (stars) are visible as thickenings of the median/transverse nerve. Also two blindly-ending thoracic PSOs (arrows) are visible. Oe = oesophagus, Tr = trachea.