comment added almost 14 years ago by Istvan Miko

The border between the pharynx and cibarium have to be defined. The brain connectives of the frontal ganglion separates the site of origin of the pharyngeal and cibarial dilator muscles (Snodgrass 1956). Beside that the hypopharyngeal rod is given as the anterior limit of the pharynx: The hypopharyngeal rod distally serves as the site of insertion of muscles 33, 32, and proximally as the site of insertion of muscle 37, and hence it might be equivalent with the hypopharyngeal suspensorium of the cockroach, hence marking the limit between the cibarium and the pharynx (Snodgrass 1956). So, this whole thing have to be revisited!!!! it would be important to find some histological/developmental evidences about the border between the cibarium and pharynx.