part of head segmentation anterior head segmentation biological_process See also the fly_anatomy.ontology term 'procephalic segment ; FBbt:00000007' and its children. Partitioning the insect head anlage into procephalic (labral, (ocular), antennal and intercalary) segments. The procephalic segments lie anterior to the gnathal (posterior head) segments, and are pattered by different segmentation gene cascades to the abdominal, thoracic and posterior head (gnathal) segments. GO:0035288 procephalic segmentation anterior head development