3) Nerves related with the opercular movement (Fig. 4 and 6)
Ramus maxillaris of the nervus trigeminus has its starting point at the ventro-anterior of the
medulla oblongata, then, runs forward ventrally. After penetrating into the hole between the
Os. and Oalis., it is divided into the Rma. of the main trunk and a branch. The latter branch
changes its direction backward under the Os. and runs to the Maoa. . It is divided again at its
periphery