Figure 2
From: Internal receptors in insect appendages project directly into a special brain neuropile
Intersegmental projections from leg afferents. Central projections as seen after filling the anterior branch of leg nerve 5B2 in the first tarsal segment of the middle leg in a third instar nymph (drawn from confocal data). Sensory fibres from tarsal sensilla form massive projections in the mesothoracic ganglion (arrow). In addition a single fibre ascends towards the brain without any side branches. The fibre terminates with numerous blebby endings in a neuropile called the superficial ventral inferior protocerebrum (SVIP). The inset shows a confocal image of these terminals at higher magnification and high gain. Scale: 100 μm, 20 μm in inset.