cibarial muscle adult ptilinal muscle fronto-pharyngeal muscle 17 2022-07-05T13:30:44Z FBbt:00058807 fly_anatomy.ontology fronto-pharyngeal muscle retractor of vertex muscle Temporary muscle extending from the vertex to the cibarium. It is inserted partly on the ocular sclerites and partly on the lateral margins of vertex, caudal to the oculo-antennal muscles. These muscles appear to pull in the vertex during the deflation of the head. As with other temporary eclosion muscles, it soon degenerates and is not found in older flies. temporary eclosion muscle