The facial skeleton comprises the facial bones that may attach to build a portion of the skull.[1] The remainder of the skull is the neurocranium.
In human anatomy and development, the facial skeleton is sometimes called the membranous viscerocranium, which comprises the mandible and dermatocranial elements that are not part of the braincase.
Structure
In the human skull, the facial skeleton consists of fourteen bones in the face:[1][2]
Elements of the cartilaginous viscerocranium (i.e., splanchnocranial elements), such as the hyoid bone, are sometimes considered part of the facial skeleton. The ethmoid bone (or a part of it) and also the sphenoid bone are sometimes included, but otherwise considered part of the neurocranium. Because the maxillary bones are fused, they are often collectively listed as only one bone. The mandible is generally considered separately from the cranium.
Variation in craniofacial form between humans is largely due to differing patterns of biological inheritance. Cross-analysis of osteological variables and genome-wide SNPs has identified specific genes that control this craniofacial development. Of these genes, DCHS2, RUNX2, GLI3, PAX1 and PAX3 were found to determine nasal morphology, whereas EDAR impacts chin protrusion.[3]
Additional images
Human facial skeleton. Front view.
Human skull. Lateral view.
Facial bones and neurocranium (labeled as "Brain case").
^"Divisions of the Skeleton". U.S. National Cancer Institute's Surveillance, Epidemiology and End Results (SEER) Program. Archived from the original on 14 January 2009. Retrieved 24 August 2017.{{cite web}}: CS1 maint: bot: original URL status unknown (link)