Supply to specific neuropils in B. granulatus . A: Surface renderings of the ventral cerebral vasculature and the neuropils of ventral neuromeres in the prosomal ganglion give an overview of the supply system of the subesophageal ganglion; in dorsal view. B: Surface renderings of the posterior cerebral vasculature and the neuropils of posterior neuromeres in the prosomal ganglion showing supply to the neuropil of the leg neuromere IV (NpIV); in posterolateral view; arrowheads indicate vessel loops that protrude into the neuropil. C: Volume rendering of supplying arteries emanating from the left pedipalpal artery (Pp) and leg artery I (I); in ventrolateral view; arrowheads indicate arteries that emanate from the appendage artery. D: Volume rendering of arteries supplying the pedipalpal neuropil (vPpn) showing vessel loops that protrude into the neuropil; in anterior view; arrowhead indicates larger, dorsal vessel loops, arrows indicate smaller, ventral vessel loops. E: Virtual horizontal section through ventral parts of the prosomal ganglion showing the postneuropilar arteries (PnaIV); in dorsal view; inset shows the position of the section, arrowheads indicate the postneuropilar arteries. F: Schematic drawing of the supply system of an isolated neuropil showing the network of supplying arteries (vNp); in dorsal view. Abbreviations: CaIV, coxal artery IV; Cca, central collection artery; Ev, efferent vessel; La, leg artery; Np, neuropil; NpII + IV, neuropil of leg II + IV neuromere; Pc, pedipalpocoxal arteries; PnaIV, postneuropilar artery of leg IV neuromere; Pp, pedipalpal artery; Ppn, neuropile of pedipalpal neuromere; Tga, transganglionic artery; vNp, vessels of a certain neuropil; vPnp, vessels of posterior neuropil; vPpn, vessels of pedipalpal neuropil.