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The process that results in the patterns of cell differentiation that will arise in an embryo. A biological process whose specific outcome is the progression of an integrated living unit: an anatomical structure (which may be a subcellular structure, cell, tissue, or organ), or organism over time from an initial condition to a later condition. 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 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. 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 regionalization process that divides an organism or part of an organism into a series of semi-repetitive parts, or segments, often arranged along a longitudinal axis. The specification of the characteristic structures of the head segments 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 biological process whose specific outcome is the progression of a multicellular organism over time from an initial condition (e.g. a zygote or a young adult) to a later condition (e.g. a multicellular animal or an aged adult).

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: head segmentation
Acc: GO:0035287
Aspect: Biological Process
Desc: 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).
Proteins in PDR annotated with:
   This term: 2 [Search]
   Term or descendants: 29 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0035287 - head segmentation (interactive image map)
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