Facial skeleton
The facial skeleton comprises fourteen bones forming part of the skull.
The facial skeleton is the group of bones that form the front part of the skull, with the rest of the skull being the neurocranium. In human anatomy, this structure is also known as the membranous viscerocranium, which includes the mandible and those dermatocranial elements that are not part of the braincase. The facial skeleton is made up of fourteen bones: two inferior turbinals, two lacrimal bones, the mandible, two maxillae, two nasal bones, two palatine bones, the vomer, and two zygomatic bones. Some variations exist: elements from the cartilaginous viscerocranium, like the hyoid bone, are occasionally grouped with the facial skeleton, and parts of the ethmoid or sphenoid bones are sometimes included, though they are typically considered part of the neurocranium. Because the maxillary bones are fused, they are often listed as a single bone, and the mandible is usually treated separately from the rest of the cranium. Developmentally, the facial skeleton is made of dermal bone and originates from neural crest cells or from the sclerotome of the mesoderm. In cartilaginous vertebrates like Chondricthyes, these bones are not replaced through endochondral ossification. Differences in human facial shape are largely due to genetic inheritance, with specific genes such as DCHS2, RUNX2, GLI3, PAX1, and PAX3 influencing nasal form, while EDAR affects chin protrusion.
- bones_in_facial_skeleton
- 14
- alternative_name
- membranous viscerocranium
- development_origin
- neural crest cells or sclerotome from mesoderm
- part_of
- skull (alongside neurocranium)
- variation_genes
- DCHS2, RUNX2, GLI3, PAX1, PAX3, EDAR
Quick Facts
- Latin
- ossa faciei, ossa facialia
- Partof
- Face, skeleton
Facts from the source article.
Lore & Background
The facial skeleton is composed of dermal bone and derived from the neural crest cells, which also contribute to the neurocranium, teeth, and adrenal medulla, or from the sclerotome derived from the somite block of the mesoderm. As with the neurocranium, in cartilaginous vertebrates such as Chondricthyes, these bones are not replaced via endochondral ossification. Elements of the cartilaginous viscerocranium, such as the hyoid bone, are sometimes considered part of the facial skeleton, and the ethmoid and sphenoid bones are occasionally included but otherwise regarded as part of the neurocranium.
Reader's Guide
The facial skeleton is significant as the structural foundation of the human face, comprising fourteen bones that include the mandible, maxilla, nasal bones, and zygomatic bones. Its development from neural crest cells or sclerotome links it to broader craniofacial formation. Variation in craniofacial form between humans is largely due to differing patterns of biological inheritance, with specific genes such as DCHS2, RUNX2, GLI3, PAX1, and PAX3 determining nasal morphology, and EDAR impacting chin protrusion. The facial skeleton is sometimes considered to include the hyoid bone or parts of the ethmoid and sphenoid bones, though these are disputed. Its study aids understanding of human anatomy, development, and genetic influences on facial structure.
Did You Know?
- The facial skeleton is sometimes called the membranous viscerocranium.
- It consists of fourteen bones: inferior turbinal, lacrimal, mandible, maxilla, nasal, palatine, vomer, and zygomatic.
- The ethmoid and sphenoid bones are sometimes included in the facial skeleton but otherwise considered part of the neurocranium.
- Genes DCHS2, RUNX2, GLI3, PAX1, and PAX3 determine nasal morphology, while EDAR impacts chin protrusion.
Frequently Asked Questions
Who is Facial skeleton?
The Facial skeleton is a collective of fourteen bones that build out the structural framework of the human face. In anatomical literature it is also referred to as the membranous viscerocranium, and it sits alongside the neurocranium to complete the full skull.
What are Facial skeleton's powers/role?
Its core job is to supply the bony architecture for the eye orbits, nasal passages, and oral cavity while anchoring the muscles and ligaments needed for chewing, facial expression, and airflow. The roster includes the mandible, maxilla, zygomatic bones, nasal bones, lacrimal bones, palatine bones, vomer, and inferior turbinates.
How does Facial skeleton's story end?
Developmentally, its bones arise from neural crest cells and, for certain elements, from sclerotome tissue of mesodermal origin. The final shaping of the structure is governed by a set of regulatory genes such as DCHS2, RUNX2, GLI3, PAX1, PAX3, and EDAR.
Why is Facial skeleton important?
Without its fourteen bones the face would lack the rigid platform required to house the eyes, support the nose, and drive the jaw mechanism for mastication. It also works in concert with the neurocranium to shield deeper structures while defining the overall contour of the head.
What team does Facial skeleton belong to?
It is one division of the broader skull assembly, serving as the facial counterpart to the neurocranium (braincase). Together these two divisions constitute the complete cranial structure in human anatomy.
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