Figure 9 in Neurobiology and vision of jumping spiders (Araneae: Salticidae)

Figure 9. Sections through the CNS, stained with reduced silver impregnation to highlight nerve fibers. 1, Half transverse section between the first and second legs of a sixth instar Phidippus johnsoni. Longitudinal tracts (in a plane perpendicular to the page) are highlighted in yellow. At multiple levels commissures, or transverse tracts cross the midline, connecting the right and left ganglia of each segment. The CP tract originates with the posterior end of a corpus pendunculatus and the ipsilateral lateral neuropile of the protocerebrum. 2, Sagittal section through the fused subesophageal ganglia of a fifth instar P. clarus, showing medial longitudinal nerve tracts and segmental commissures separated by blood vessels. A recurrent nerve runs along the top of the esophagus, just behind the preoral rostral ganglion.