First branchial arch

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First branchial arch
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Diagram showing the regions of the adult face and neck related to the fronto-nasal process and the branchial arches.
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Under surface of the head of a human embryo about twenty-nine days old.
Gray's subject #13 66
MeSH Branchial+Region
Dorlands/Elsevier a_57/12149860

The first branchial arch, also called the first pharyngeal arch and mandibular arch, is the first of six branchial arches that develops in fetal life. It is located between the stomodeum and the first pharyngeal groove.

Processes

This arch divides into a maxillary process and a mandibular process, giving rise to structures including the bones of the lower two-thirds of the face and the jaw. The maxillary process becomes the maxilla (or upper jaw), and palate while the mandibular process becomes the lower jaw. This arch also gives rise to the muscles of mastication.

Innervation of the two processes of the first branchial arch is provided by two distinct branches of the trigeminal nerve (CN V),[1] the mandibular and maxillary branches. The artery of the first arch is the first aortic arch,[2] which partially persists as the maxillary artery.

Meckel's cartilage

Meckel's cartilage forms in the mesoderm of the mandibular process and eventually regresses to form the incus and malleus of the middle ear; the anterior ligament of the malleus and the sphenomandibular ligament. The mandible or lower jaw forms by intramembranous ossification using Meckel's cartilage as a 'template', but the mandible does not arise from direct ossification of Meckel's cartilage.

Derivatives of the first arch

Derivatives of the first arch:

Additional images

References

  1. Harris, Edward F., 2002. Craniofacial Growth and Development.
  2. McMinn, R., 1994. Last's anatomy: Regional and applied (9th ed).

External links


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