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Any developmental process that results in the creation of defined areas or spaces within an organism to which cells respond and eventually are instructed to differentiate. Partitioning the head anlage into a fixed number of segmental units. The number of segments composing the insect head has long been a subject of debate, but it is generally agreed that there are 6 or 7 segments. From anterior to posterior the head segments are the procephalic segments (labral, (ocular), antennal and intercalary) and the gnathal segments (mandibular, maxillary and labial). Partitioning the posterior region of the head anlage into gnathal (mandibular, maxillary and labial) segments. Unlike the anterior head (procephalic) segments, formation of the posterior head (gnathal) segments occurs by a similar mechanism to trunk segmentation, where a cascade of gap genes, pair-rule genes and segment-polarity genes subdivide the embryo into progressively smaller domains. The specification of the characteristic structures of the labial segment following establishment of segment boundaries. Identity is considered to be the aggregate of characteristics by which a structure is recognized. The hierarchical steps resulting in the progressive subdivision of the anterior/posterior axis of the embryo. The specification of the characteristic structures of the mandibular segment following establishment of segment boundaries. Identity is considered to be the aggregate of characteristics by which a structure is recognized. The specification of the characteristic structures of the maxillary segment following establishment of segment boundaries. Identity is considered to be the aggregate of characteristics by which a structure is recognized.

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: posterior head segmentation
Acc: GO:0035289
Aspect: Biological Process
Desc: Partitioning the posterior region of the head anlage into gnathal (mandibular, maxillary and labial) segments. Unlike the anterior head (procephalic) segments, formation of the posterior head (gnathal) segments occurs by a similar mechanism to trunk segmentation, where a cascade of gap genes, pair-rule genes and segment-polarity genes subdivide the embryo into progressively smaller domains.
Synonyms:
  • gnathal segmentation
Proteins in PDR annotated with:
   This term: 10 [Search]
   Term or descendants: 22 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0035289 - posterior head segmentation (interactive image map)
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