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Fig. 4. Histology of the distal venom delivery system. (A) Frontal section of a spitting cobra Naja sputatrix showing the soft tissue chambers within the fang sheath. (B) Parasagittal section through N. sputatrix showing the venom duct approaching the lateral margin of the fang sheath. (C) Transverse section through the fang sheath of a non-spitting cobra N. melanoleuca illustrating the links between the fang sheath and the maxilla and the internal partitions of the fang sheath. c, venom chamber; d, venom duct; f, fang; m, maxilla; pa, palatine; s, fang sheath; v, venom vestibule.