Fig. 2. Schematic diagram illustrating the different transections performed in
various groups of fish in the different series of experiments. Control fish
had all their cranial nerves intact (both series I and II). In the
gill-denervated group, all branches of cranial nerves IX and X to the gills
were sectioned where they enter the gills (series I). For the gill- and
orobranchial-cavity-denervated group, all branches of cranial nerve V to the
roof of the mouth as well as the palatine branches of VII and the opercular
branches of VII to the floor of the mouth were also denervated (series I). In
series II, the fish were decerebrate and spinalectomized, cranial nerves IX
and X were transected where they originated from the brain within the cranium
and cranial nerves V and VII were sectioned as in series I.
