R. hyoideus goes out of the hole of the Ohyo. after separating from the main trunk of the
n.trigeminus and runs backward along the inside of the Oop. and also dorsally to the Oc. . At
the past point of the Oc, it sends out a branch ventrally. This branch is divided into four
branches at the hidden point under the R. . Each pair of these branches goes ventro-anteriorly
or ventro-posteriorly at the anterior area of the Mar. . On the other hand, the main trunk of the
r.hyoideus runs backward and soon divides itself after sending a branch one time. Ventral
branch ofthis divided trunk innervates the ventro-lateral surface ofthe Mar. . Its dorsal branch